In the given figure the equation m∠MRS + m∠MRO = 180° is the postulate describing the linear pair of angles.
What is an angle?The English word "angle" derives from the Latin word "angulus," which means "corner." The vertex and the two rays are referred to as the sides of an angle, respectively, and are the shared termini of two rays.
It is given that -
∠MRS ≅ ∠MRO
Now, what that means is that ∠MRS is congruent to ∠MRO.
Thus, to understand this concept of equality or congruence, we can prove it since from the given image, we see that -
m∠MRS = m∠MRO = 90°
Since they are both right angles then we can say that the correct theorem is the definition of a right angle triangle.
m∠MRS + m∠MRO = 180°
It is seen that the angles form a linear pair and lie on the same plane.
Therefore, the correct postulate is linear pair.
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Chantal has saved $5000.She put it in a savings account that earns 2.5% simple interest.How much interest will she earn after 3 years?
The amount of interest she will earn at the end of 3 years would be = $375
How to calculate the simple interest earned by Chantal?The principal amount of money saved by Chantal (p)= $5000
The interest rate that the amount generates (r)= 2.5%
The total time for the savings(t) = 3 years.
The simple interest generated S.I = P×T×R/100
= 5000×3×2.5/100
= 37500/100
= $375
Therefore the amount of money she will earn as interest after three years of savings would be = $375.
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Does someone mind helping me with this problem? Thank you!
The amount we would have after 40 years will be $8183.27
What is an exponential growth?Exponential growth is a pattern of data that shows greater increases with passing time, creating the curve of an exponential function.
Given that, an amount increasing exponentially every two years and with a rate of 15% and the amount is $500, we need to find the amount we would have after 40 years.
Since, the amount is increasing exponentially every two years, therefore,
T = 40 / 2 = 20 years
A = P(1+0.15)²⁰
A = 500(1+0.15)²⁰
A = 500(1.15)²⁰
A = 8183.27
Hence, the amount we would have after 40 years will be $8183.27
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(5)/(x-5)=5+(x)/(x-5) Is the equation an identity, a conditional equation, or an inconsistent equation?
The given equation (5)/(x - 5) = 5 + (x)/(x - 5) is a conditional equation.
We can simplify the equation as follows:
(5)/(x - 5) - (x)/(x - 5) = 5
(5 - x)/(x - 5) = 5
Now, we can cross-multiply to get rid of the fraction:
5 - x = 5(x - 5)
Distributing the 5 on the right side of the equation gives us:
5 - x = 5x - 25
Adding x to both sides and adding 25 to both sides gives us:
30 = 6x
Dividing both sides by 6 gives us:
x = 5
Since the equation has a solution, it is a conditional equation. Therefore, the answer is a conditional equation.
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Question 5 please someone solve its functions and composite functions
The value of kˣ for the exponential function is [tex]27^{(1/x)}.[/tex]
What is the value of kˣ?We can use the properties of exponents to solve this problem and determine the value of kˣ.
To find the value of h(3x), we can use the property that [tex](a^b)^c = a^{bc}[/tex] for any real numbers a, b, and c. This is shown in the solution below.
h(3x) = 3³ˣ (since h(x) = 3ˣ)
= (3³)ˣ
= 27ˣ
Therefore, we have:
kˣ = 27ˣ
To find the value of kˣ, we can take the x-th root of both sides:
[tex]k = 27^{(1/x)}[/tex]
So, the value of kˣ is [tex]27^{(1/x)}[/tex].
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Solve the following absolute value inequality. Type your answer using interval notation. Make sure that you use brackets ( or parentheses () as appropriate. If there is no solution, say so. 4| x +3| + 6 < 2
To solve the absolute value inequality, we need to isolate the absolute value expression on one side of the inequality and then solve for x. Here are the steps:
4| x +3| + 6 < 2
4| x +3| < -4 (Subtract 6 from both sides)
| x +3| < -1 (Divide both sides by 4)
Since the absolute value of any expression is always positive, there is no solution to this inequality. In interval notation, we can write the solution as ∅ (empty set).
Answer: ∅
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The weight of potato chips in a small-size bag is stated to be 5 ounces. The amount that the packaging machine puts in these bags is believed to have a normal model with a mean of 5.1 ounces and a standard deviation of 0.07 ounces.
a) What fraction of all bags sold are underweight? Round to four decimal places.
b) Some of the chips are sold in "bargain packs" of 5 bags. What's the probability that none of the 5 is underweight?
c) What's the probability that the mean weight of the 5 bags is below the stated amount?
d) What's the probability that the mean weight of a 20-bag case of potato chips is below 5 ounces?
a) approximately 7.64% of all bags sold are underweight.
b) the probability that none of the 5 bags is underweight is approximately 0.5595 or 55.95%
c) the probability that the mean weight of the 5 bags is below 5 ounces is approximately 0.0007 or 0.07%
d) the probability that the mean weight of a 20-bag case of potato chips is below 5 ounces is very close to 0.
What is the justification for the above response?a) To find the fraction of all bags sold that are underweight, we need to find the area under the normal distribution curve to the left of 5 ounces. Using the standard normal distribution, we can calculate the z-score:
z = (5 - 5.1) / 0.07 = -1.43
Using a standard normal distribution table or calculator, we can find that the area to the left of z = -1.43 is 0.0764. Therefore, approximately 7.64% of all bags sold are underweight.
b) To find the probability that none of the 5 bags in a bargain pack is underweight, we need to find the probability that each individual bag is not underweight. Using the result from part (a), the probability that one bag is underweight is approximately 0.0764. Therefore, the probability that none of the 5 bags is underweight is:
(1 - 0.0764)⁵ = 0.5595
Rounding to four decimal places, the probability that none of the 5 bags is underweight is approximately 0.5595 or 55.95%
c) To find the probability that the mean weight of the 5 bags is below the stated amount of 5 ounces, we need to use the sampling distribution of the mean. The mean of the sampling distribution is the same as the population mean, 5.1 ounces. The standard deviation of the sampling distribution is the standard deviation of the population divided by the square root of the sample size:
s = 0.07 / √(5) = 0.0313
The z-score for a sample mean of 5 ounces is:
z = (5 - 5.1) / 0.0313
= -3.19
Using a standard normal distribution table or calculator, we can find that the area to the left of z = -3.19 is approximately 0.0007.
Therefore, the probability that the mean weight of the 5 bags is below 5 ounces is approximately 0.0007 or 0.07%
d) To find the probability that the mean weight of a 20-bag case of potato chips is below 5 ounces, we need to use the sampling distribution of the mean again. The mean of the sampling distribution is still 5.1 ounces. The standard deviation of the sampling distribution is:
s = 0.07 / √(20)
= 0.0157
The z-score for a sample mean of 5 ounces is:
z = (5 - 5.1) / 0.0157
= -6.37
Using a standard normal distribution table or calculator, we can find that the area to the left of z = -6.37 is essentially 0.
Therefore, the probability that the mean weight of a 20-bag case of potato chips is below 5 ounces is very close to 0.
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Question 4: You are creating an obstacle for a community event. The area of the
rectangular space is represented by the expression 8x² - 12x. The width of the rectangular
space is represented by the expression 4x.
Part A: Write an expression to represent the length of
the rectangular space. (1 pts)
Show all work to find the length (3pts)
6.03 & 6.04
Answer: Length of Rectangular Space (1 pt)
Part B: Prove your answer from Part A is correct by
multiplying the length and width of the rectangle. Show
all work (4 pts)
Answer (1 pt) Write the expression in standard form:
The expression to represent the length of the rectangular space is 2x - 3.
What connection exists between a rectangular space's area, length, and width?The product of the length and breadth makes up the area of a rectangular space. Area is defined mathematically as Length x Width. So, using the equation Length = Area / Width, we can determine the length of a rectangular space if we know its area and breadth. Instead, using the formula Width = Area / Length, we may determine the width of a rectangular region if we know its area and length.
Given that the width of the rectangle is 4x.
The Area of the rectangle is given as:
A = lw
Substituting the values we have:
8x² - 12x = 4x (Length)
l = 2x - 3
Hence, the expression to represent the length of the rectangular space is 2x - 3.
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a car has a circular turning radius of 16.1 ft. the distance between the two front tires is 4.7 ft. how much further does a tire on the outside of the turn travel than a tire on the inside.
Answer:
When a car turns, the tire on the outside of the turn has to travel a greater distance than the tire on the inside of the turn. The difference in the distance traveled by the two tires is equal to the circumference of the circle that the car makes during the turn.
The radius of the circle is given as 16.1 ft, which means the diameter is 2 * 16.1 = 32.2 ft. The distance between the two front tires is given as 4.7 ft, which means that the radius of the circle traced by the inner tire is 16.1 - 2.35 = 13.75 ft, where 2.35 ft is half of the distance between the two front tires.
The circumference of the circle traced by the outer tire is 2 * π * 16.1 = 101.366 ft (rounded to three decimal places). The circumference of the circle traced by the inner tire is 2 * π * 13.75 = 86.415 ft (rounded to three decimal places).
The difference in the distance traveled by the two tires is:
101.366 - 86.415 = 14.951 ft (rounded to three decimal places)
Therefore, the tire on the outside of the turn travels about 14.951 ft further than the tire on the inside.
Solve the equation. 4(x - 2) = 2(2x + 6) 4x – [?] = [__] + [__] First we must use the distributive property to expand our equations. Hint: Calculate and enter the value of 4•2. ______________
The equation 4(x - 2) = 2(2x + 6) has no solution.
To solve the equation 4(x - 2) = 2(2x + 6), we must first use the distributive property to expand the equations. The distributive property states that a(b + c) = ab + ac.
Using the distributive property, we can expand the equation as follows:
4(x - 2) = 2(2x + 6)
4x - 8 = 4x + 12
Next, we must isolate the variable on one side of the equation. We can do this by subtracting 4x from both sides of the equation:
-8 = 12
This equation is not true, so there is no solution to the equation 4(x - 2) = 2(2x + 6).
In conclusion, the equation 4(x - 2) = 2(2x + 6) has no solution.
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Please help me i have a screenshot
2 1/8 pints
2.125 pints
College Algebra -3.1Modeling with Quadratics Angry Birss: * Cire cact aniwns. Hhe enty the fusctien to obraln yoar answerc. - Show all nocensary cakiadsina. - Wine your ancurers is complrte aeatrnces 1. Whor is the s-inerreept and nhat does a repreiert? 2. What is the ponatire eimerreps and whas doest throsetinaly tepereset? socirt?
The x-intercept is (-3,0) and the y-intercept is (0,9).
The x-intercept of a quadratic function is the point where the function intersects with the x-axis. This point represents the value of x for which the function is equal to 0. The x-intercept can be found by setting the function equal to 0 and solving for x.
The y-intercept of a quadratic function is the point where the function intersects with the y-axis. This point represents the value of y for which the function is equal to 0. The y-intercept can be found by setting x equal to 0 and solving for y.
1. The x-intercept of the function is (-3,0) and it represents the point where the function intersects with the x-axis.
2. The y-intercept of the function is (0,9) and it represents the point where the function intersects with the y-axis.
To find the x-intercept, set the function equal to 0 and solve for x:
0 = x^2 + 6x + 9
0 = (x+3)(x+3)
x = -3
To find the y-intercept, set x equal to 0 and solve for y:
y = 0^2 + 6(0) + 9
y = 9
Therefore, the x-intercept is (-3,0) and the y-intercept is (0,9).
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What is the value of m
Answer:
Step-by-step explanation:
Ok so we're just going to be doing a lot of supplementary work:
The angle adjacent to 85 degrees is equal to 180 - 85 = 95
We want to find the angle measures in the triangle where 95 degrees is. We can do this by using 40, finding the opposite angle, which is also 40 due to vertical angles theorem, finding the missing angle in the right-most triangle which is 180 - 105 - 40 = 35
Using vertical angles theorem again, we know the angle opposite 35 degrees is also 35. We found another angle for the middle triangle.
The missing angle for the middle triangle is 180 - 35 - 95 = 50
The angle opposite 50 is 50 because of the vertical- you already know.
Now the left triangle has angles Z, 60 and 50.
m<Z = 180 - 60 - 50
m<Z = 70
Hope this helps!
Can someone please help with ThIS ASAP
Answer:
h: x - y = -3k: 4x +y = 12Step-by-step explanation:
You want linear equations in standard form that describe the relations in the given tables.
Standard formA useful two-point formula for creating an equation in general form is ...
(y2 -y1)(x -x1) -(x2 -x1)(y -y1) = 0
This will simplify to an equation of the form ...
ax +by +c = 0 . . . . . . general form equation for a line
The corresponding standard form equation is ...
ax +by = -c . . . . . . . . standard form equation for a line
The standard form has mutually prime coefficients and a positive leading coefficient. That may require removal of any common factors.
Line h(2 -(-2))(x -(-5) -(-1 -(-5))(y -(-2)) = 0
4x +20 -4y -8 = 0 . . . . . . . . coefficients have a common factor of 4
x -y +3 = 0 . . . . . . . . . general form
x -y = -3 . . . . . . . . . standard form
Line k(12 -20)(x -(-2)) -(0 -(-2))(y -20) = 0
-8x -16 -2y +40 = 0 . . . . . . coefficients have a common factor of -2
4x +y -12 = 0 . . . . . . . . simplified to general form
4x +y = 12 . . . . . . standard form
__
Additional comment
Another useful form of the equation of a line is "intercept form":
x/a +y/b = 1 . . . . . . . where 'a' is the x-intercept and 'b' is the y-intercept
The table for line k shows the x-intercept is (3, 0) and the y-intercept is (0, 12). Then the line can be written as ...
x/3 +y/12 = 1
Multiplying by 12 gives ...
4x +y = 12 . . . . the required standard form
How many real zeros does the polynomial function f(x)=4x^(3)-3x+2x^(4)-x^(2)+7 have
The polynomial function [tex]f(x) = 4x^3 - 3x + 2x^4 - x^2 + 7[/tex] has no 0 real zeros.
The polynomial function [tex]f(x) = 4x^3 - 3x + 2x^4 - x^2 + 7[/tex] can be rearranged to make it easier to find the real zeros.
[tex]f(x) = 2x^4 + 4x^3 - x^2 - 3x + 7[/tex]
To find the real zeros of this polynomial, we need to use the Rational Root Theorem. This theorem states that if a polynomial has a rational root, it must be a factor of the constant term (7) divided by a factor of the leading coefficient (2).
The possible rational roots are: ±1, ±7, ±1/2, ±7/2
We can use synthetic division to test each of these possible roots until we find one that gives us a remainder of 0.
Using synthetic division, we find that none of the possible rational roots are actually roots of the polynomial. This means that the polynomial has no real zeros.
Therefore, the answer is 0. The polynomial function [tex]f(x) = 4x^3 - 3x + 2x^4 - x^2 + 7[/tex] has no 0 real zeros.
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May anyone help me with this ?
Answer:
x+8+2x-5. 2x+x+8-5. x=3
Copy and complete the tables for sector of a circle.
Note: please add steps explaining
The completed table showing the radius, angle at the center, arc length, and area of the sector of the circle are as follows;
[tex]{}[/tex] Radius Angle at center Arc Length Area
(a) 4 cm [tex]{}[/tex] 1.25 rad 5 cm 22.5 cm²
(b) [tex]{}[/tex] 6 cm 1.5 rad 9 cm 22.5 cm²
(c) [tex]{}[/tex] 12 cm 0.8 rad 9.6 m 57.6 m²
(d) [tex]{}[/tex] 10 m 1.2 rad 12 m 60 m²
(e) [tex]{}[/tex] 8 mm 2 rad 16 mm 64 mm²
(f) [tex]{}[/tex] 9 mm (2/3) rad 6 mm 27 mm²
What is a sector of a circle?A sector of a circle is a part of a circle that is pie shaped, with parts including, two radii of the circle and part of the circumference of the circle.
4(a) The specified dimensions of the sectors of the circles are;
Radius = 4 cm
Angle at the center = 1.25 radians
The arc length is therefore;
Arc length = 2 × π × 4 cm × 1.25 rad/(2·π rad) = 5 cmThe area of the sector is therefore;
Area = π × (6 cm)² × 1.25/(2·π) = 22.5 cm²(b) Radius = 6 cm
Arc length = 9 cm
The angle at the center, θ, is therefore;
Arc length = 2×π×6 × θ/(2·π) = 9
6 × θ = 9
θ = 9/6 = 1.5
The angle at the center = 1.5 radiansArea = π × (6 cm)² × 1.25/(2·π) = 36 cm² × 1.25/2 = 22.5 cm²(c) Angle at center = 0.8 rad
Arc length = 9.6 m
Arc length = 2×π× Radius × 0.8 rad/(2·π rad) = 9.6
Radius = 9.6 m/0.8 = 12 m
The radius of the circle is 12 cmThe area of the circle, is therefore; π × (12 m)² × (0.8 rad/(2·π rad)) = 57.6 m²(d) Angle at the center = 1.2 radians
Area = 60 m²
The area = π × (Radius)² × 1.2/(2·π) = 60 m²
(Radius)² × 0.6 = 60 m²
(Radius)² = 60 m²/(0.6) = 100 m²
Radius = √(100 m²) = 10 mThe arc length = 2 × π × 10 mm × 1.2/(2·π) = 12 mm
The arc length = 12 mm(e) The radius of the circle = 8 mm
The area of the sector = 64 mm²
The angle at the center, θ, can therefore, be found as follows;
Area = π × (8 mm)² × θ/(2·π) = 64 mm²
θ = 2 × 64 mm²/((8 mm)²) rad = 2 rad
The angle at the center, θ = 2 radiansArc length = 2×π× 8 mm × 2/(2·π) = 16 mm(f) Arc length = 6 mm
Area = 27 mm²
The radius and angle at the are found as follows
Let r represent the radius, we get;
Arc length = 2 × π × r × θ/(2·π) = 6
Therefore; θ = 6/r
Area of the sector = π × r² × θ/(2·π) = 27 mm²
Therefore; π × r² × (1 mm²) × (6/(r × 1 mm))/(2·π) = 27 mm²
r × (1 mm) × 3 = 27 mm²
r = 27 mm²/(3 × 1 mm) = 9 mm
The radius, r = 9 mmAngle at the center, θ = 6/9 rad = (2/3) radPlease find the completed table for the sectors of a circle above
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C=15.50-0.20x How much credit is left on the card after Deshaun uses it for 30 minutes of calls?
The correct answer is $9.50 of credit is left on the card. To find out how much credit is left on the card after Deshaun uses it for 30 minutes of calls, we need to plug in the value of x into the equation C=15.50-0.20x.
Deshaun has a card with $15.50 of credit on it. He is using it to make calls and the cost of each minute of calling is $0.20. To calculate how much credit Deshaun has left on his card after 30 minutes of calls, we need to use the equation C=15.50-0.20x, where x is the number of minutes of calls.
Since x represents the number of minutes of calls, we will plug in 30 for x:
C = 15.50 - 0.20(30)
C = 15.50 - 6
C = 9.50
Therefore, there is $9.50 of credit left on the card after Deshaun uses it for 30 minutes of calls.
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Use the properties of logarithms to expand the expression as a sum, difference, and/or constant multiple of logarithms. (Assume the variable is positive.)
The expression [tex]log(x^4)[/tex] can be expanded as a constant multiple of log(x).
What is the logarithms?
A logarithm is a mathematical function that measures the number of times a given value (called the base) must be multiplied by itself to produce a specified value.
We can use the following properties of logarithms to expand the expression:
log(a * b) = log(a) + log(b)log(a / b) = log(a) - log(b)[tex]log(a^n) = n * log(a)[/tex]The expression [tex]log(x^4[/tex]) can be expanded using the following property of logarithms:
[tex]log(a^n) = n * log(a)[/tex]
Using this property, we can write:
[tex]log(x^4) = 4 * log(x)[/tex]
Hence, the expression [tex]log(x^4)[/tex] can be expanded as a constant multiple of log(x).
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What is the solution of this inequality?
The whole number that is a solution for the inequality x ≥ 4 but is not a solution for the inequality x > 4 is 4.
Option B is the correct answer.
What is inequality?It shows a relationship between two numbers or two expressions.
There are commonly used four inequalities:
Less than = <
Greater than = >
Less than and equal = ≤
Greater than and equal = ≥
here,
We have,
x ≥ 4 and x > 4
Now,
x ≥ 4 means that x can be 4 and greater than 4.
x > 4 mean x is greater than 4.
So,
4 is a solution to x ≥ 4 but not a solution to x > 4.
Thus,
4 is the whole number.
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The selling price of each cup of lemon juice is 3/2 times as much as the selling price of a cup of apple juice. For every 2 cups of lemon juice sold, Mr Tan sells 5 cups of apple juice. He earns $12 more from apple juice than from lemon juice. How much does Mr Tan earn altogether?
Answer:
Let's start by assigning variables to the unknowns in the problem:
Let x be the selling price of a cup of apple juice.
Then the selling price of a cup of lemon juice is 3/2 times x, or 1.5x.
Let y be the number of times 2 cups of lemon juice are sold (so y is an even number).
Then the number of times 5 cups of apple juice are sold is 5/2 times y, or 2.5y.
From the given information, we can set up two equations:
2.5y(x + 12) = 1.5xy (Mr Tan earns $12 more from apple juice than from lemon juice)
2(1.5x)y = 5(2.5y) (for every 2 cups of lemon juice sold, 5 cups of apple juice are sold)
Simplifying the second equation, we get:
3xy = 25y
Dividing both sides by y (which is non-zero since y is even), we get:
3x = 25
Solving for x, we get:
x = 25/3
Substituting x into the first equation and simplifying, we get:
y = 24
So Mr Tan sells 24 cups of lemon juice and 60 cups of apple juice. To find his total earnings, we can multiply the selling price by the number of cups sold for each juice and add them up:
Total earnings = 24(1.5x) + 60x
Total earnings = 36x + 60x
Total earnings = 96x
Substituting x = 25/3, we get:
Total earnings = 96(25/3)
Total earnings = 800
Therefore, Mr Tan earns $800 altogether.
What is the order on a number line left to right of 1.25, -1.25, 2 2/5, -2.1, 1/3
determine the time (in minutes ) it will take the vehicle to travel the same distance at 50 miles per hour
The following formula is used to determine how long it will take the car to cover the same distance at 50 miles per hour:
Distance (in miles) divided by Speed (in miles per hour) = Time (in hours). In this case, it is:
Distance / Speed = Time
Distance / 50 = Time
Time = Distance / 50
Time (in minutes) = (Distance / 50) * 60
Therefore, the time it will take the vehicle to travel the same distance at 50 miles perhour is (Distance / 50) * 60 minutes.
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Help me please it would mean a lot
Answer:
3) The commercial costs $900 to produce and $110 each times it is aired.
Step-by-step explanation:
We can determine how expensive it is to produce a commercial by looking at the function C(n)'s output when n = 0 (when the commercial hasn't been aired yet).
C(0) = 110(0) + 900
C(0) = $900
So, the cost of producing a commercial is $900.
We can see that $110 is added to the cost each time n is incremented by 1. Therefore, it costs $110 each time the commercial is aired.
We can put these two statements together to deduce that answer option 3 is correct:
The commercial costs $900 to produce and $110 each times it is aired.
Answer:
Option 3
Step-by-step explanation:
900 is a constant number that never changes. However, the value of "110n" changes every time it is aired, because 110 is multiplied by a different number. This means that $110 represents the cost of airing it each time, because if it was hypothetically aired three times, you would multiply 110 by 3, proving that it is the cost to air it, and $900 is the production cost. It also makes no sense to produce the same commercial over and over again, so the cost that is multiplied has to be the amount of times that it is aired.
find the sale price of a $36 item after a 50% discount
Answer:$18
Step-by-step explanation: Since 50% is half of a hundred and the item is half off, you multiply 36 by 0.5 and get $18. This is the price of the item with the sale and the the discount
Answer:
18$
Step-by-step explanation:
go to Safari and look it up is how I got the answer
Two tablets and 4 mini tablets cost $2450 . One tablet costs $870. How much does one mini tablet cost
Consider a Normal random sample X1,...,X, N (0,eϕ) where n = 60 and the parameter of interest is ϕ € R. A realisation of the random sample gives: s n x= п i=1 Σα? = 1.20
(a) Construct the method of moments estimator for 6, and calculate its numerical value.
(b) Write down the likelihood and the log-likelihood functions for 0.
(c) Write down the score and observed Fisher information functions for 0.
(d) Find the maximum likelihood estimator for 0. (e) Explain how you can use a Normal distribution to approximate the distribution of the maxi- mum likelihood estimator for 8. Hint: you will need to show that E[I (0)] = 2.
(f) Assume that the true parameter is 0 = 0. Investigate empirically the properties of the maxi- mum likelihood estimator for 0. To do this, simulate 1000 values of ÔMle. To simulate each one, you need to simulate 60 random values of X and then calculate the MLE. Once you have 1000 samples of Ômle, compare a histogram of the empirical distribution with the approximate density obtained in part (e).
The value $\frac{6}{\sqrt{2}}$
a) The method of moments estimator for ϕ is given by:
$\hat{\phi} = \frac{\sum_{i=1}^{n}X_i}{n} = \frac{1.20}{60} = 0.02$
b) The likelihood and log-likelihood functions for ϕ are given by:
Likelihood: $L(\phi) = \prod_{i=1}^{n}\frac{1}{\sqrt{2\pi e \phi}} \exp \bigg( \frac{-X_i^2}{2\phi}\bigg)$
Log-Likelihood: $lnL(\phi) = -\frac{n}{2}ln(2\pi e \phi) - \frac{1}{2\phi}\sum_{i=1}^{n}X_i^2$
c) The score and observed Fisher information functions for ϕ are given by:
Score: $S(\phi) = \frac{1}{\phi}\sum_{i=1}^{n}X_i^2 - \frac{n}{\phi}$
Observed Fisher Information: $I(\phi) = \frac{n}{\phi^2}$
d) The maximum likelihood estimator for ϕ is given by:
$\hat{\phi}_{ML} = \frac{\sum_{i=1}^{n}X_i^2}{n} = \frac{1.20^2}{60} = 0.0096$
e) To use a Normal distribution to approximate the distribution of the maximum likelihood estimator for ϕ, it is necessary to show that $E[I(\phi)] = 2$. This can be done by computing $E[I(\phi)]$ directly:
$E[I(\phi)] = \frac{1}{\phi^2}E[\sum_{i=1}^{n}X_i^2] = \frac{n}{\phi^2}E[X_i^2] = \frac{n}{\phi^2}(2\phi + \phi^2) = \frac{2n + n\phi}{\phi^2}$
Setting this equal to 2 and solving for ϕ gives $\phi = \frac{\sqrt{n}}{\sqrt{2}} = \frac{6}{\sqrt{2}}$
f) To investigate the properties of the maximum likelihood estimator for ϕ, 1000 values of ÔMle can be simulated. This can be done by first simulating 60 random values of X and then calculating the MLE for each set. After this, the 1000 samples of ÔMle can be compared to the approximate density obtained in part (e). The histogram should match the approximate density, with the distribution centered around the value $\frac{6}{\sqrt{2}}$.
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11. Determine the values of \( r \) for which \( v=\left[\begin{array}{c}2 \\ r \\ -1\end{array}\right] \) is in the span of \( \mathcal{S}=\left\{\left[\begin{array}{c}1 \\ 0 \\ -1\end{array}\right],
To determine the values of r for which v is in the span of S, we need to find a scalar multiple of the vector in S that equals v.
In other words, we need to solve the equation:
v = c* S
where c is a scalar and S is the vector in the span. Plugging in the values for v and S, we get:
\[\left[\begin{array}{c}2 \\ r \\ -1\end{array}\right] = c*\left[\begin{array}{c}1 \\ 0 \\ -1\end{array}\right]\]
To solve for c, we can equate the corresponding entries of the two vectors:
2 = c*1
r = c*0
-1 = c*-1
From the first equation, we get c = 2. Plugging this value into the third equation, we get:
-1 = 2*-1
which simplifies to:
-1 = -2
This equation is not true, so there is no value of c that satisfies all three equations.
Therefore, there is no value of r for which v is in the span of S.
The vector v is not in the span of S for any value of r.
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5 melons cost £3.50
7 melons cost £5
Are the number of melons and the cost in direct proportion? Explain how you know.
Explain without using y=kx
Answer:
Two quantities are in direct proportion if an increase in one quantity leads to a proportional increase in the other quantity. In this case, the number of melons and the cost of melons are in direct proportion if an increase in the number of melons leads to a proportional increase in the cost of melons.
To check if the given statement is true, we can use the concept of unit rate. Unit rate is the rate for one unit of a given quantity. In this case, the unit rate for melons would be the cost of one melon.
If 7 melons cost £5, then the cost of one melon can be calculated by dividing the total cost by the number of melons:
Cost of one melon = Total cost / Number of melons
= £5 / 7
= £0.714 (rounded to 3 decimal places)
Now, let's calculate the cost of different numbers of melons and see if they are in direct proportion:
For 1 melon, the cost would be £0.714
For 2 melons, the cost would be £1.429
For 3 melons, the cost would be £2.143
For 4 melons, the cost would be £2.857
For 5 melons, the cost would be £3.571
For 6 melons, the cost would be £4.286
For 7 melons, the cost would be £5.000
As we can see, the cost of melons increases proportionally with the number of melons. Therefore, we can conclude that the number of melons and the cost of melons are in direct proportion
The polynomial 18x^(2)+3x-10 is equivalent to the product of (3x-2) and the binomial:
Answer:
6x+5
To check this, we can use the distributive property of multiplication:
(3x-2)(6x+5) = 18x^2 + 15x - 12x - 10 = 18x^2 + 3x - 10
So the given polynomial is indeed equivalent to the product of (3x-2) and 6x+5.
The polynomial 18x^(2)+3x-10 is equivalent to the product of (3x-2) and the binomial 6x+5.
The polynomial 18x^(2)+3x-10 is equivalent to the product of (3x-2) and the binomial 6x+5. This can be found by factoring the polynomial into two binomials.
Find two numbers that multiply to -180 (-10 * 18) and add to 3 (the coefficient of the x term).
The two numbers are -15 and 12.
Rewrite the polynomial as 18x^(2)-15x+12x-10.
Factor by grouping: 3x(6x-5)+2(6x-5).
Factor out the common binomial: (3x-2)(6x+5).
Therefore, the polynomial 18x^(2)+3x-10 is equivalent to the product of (3x-2) and the binomial 6x+5.
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Question 6 Find a formula for the polynomial P(x) wit degree 3 real coefficients zeros at x=3-3i and x=1 y-intercept at (0,-36)
The formula for the polynomial P(x) with degree 3, real coefficients, zeros at x=3-3i and x=1, and y-intercept at (0,-36) is P(x) = -4(x-1)(x-(3-3i))(x-(3+3i)).
To find the formula for the polynomial, we first need to find the conjugate of the complex zero, which is 3+3i. This is because a polynomial with real coefficients must have complex zeros in conjugate pairs.
Next, we can use the factored form of a polynomial, P(x) = a(x-r1)(x-r2)(x-r3), where r1, r2, and r3 are the zeros of the polynomial and a is a constant. In this case, r1 = 1, r2 = 3-3i, and r3 = 3+3i.
Finally, we can use the y-intercept to find the value of a. When x = 0, P(x) = -36, so we can plug in the values and solve for a:
-36 = a(0-1)(0-(3-3i))(0-(3+3i))
-36 = a(-1)(-3+3i)(-3-3i)
-36 = a(9+9i-9i-9)
-36 = a(-36)
a = 4
So the formula for the polynomial is P(x) = 4(x-1)(x-(3-3i))(x-(3+3i)). However, since we want the y-intercept to be negative, we can multiply the entire polynomial by -1 to get P(x) = -4(x-1)(x-(3-3i))(x-(3+3i)).
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