Solve the system of equations. -5a + 7b = 2 -15a + 21b = 6
It should be noted that solving the system of equations. -5a + 7b = 2 -15a + 21b = 6 will give 0 and this implies that it has no solution
How to illustrate the information?It should be noted that we simply want to solve the equations given:
-5a + 7b = 2 ................ i
-15a + 21b = 6 ............. ii
Divide equation ii through by 3. This will give:
-5a + 7b = 6
Therefore, the equations will be:
5a + 7b = 2 ................ i
5a + 7b = 2 ................ ii
Subtract equation ii from i
This will be (5a + 7b = 2) - (5a + 7b = 2) = 0
Therefore, it should be noted that solving the system of equations. -5a + 7b = 2 -15a + 21b = 6 will give 0 and this implies that it has no solution
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8x + 5 (2x+3) = 195 find x
Answer:
x = 10
Step-by-step explanation:
We are given the following equation:
[tex]8x + 5(2x+3) = 195[/tex],
and told to find [tex]x[/tex].
In order to calculate the value of [tex]x[/tex], we have to rearrange the equation to make [tex]x[/tex] the subject:
[tex]8x + 5(2x+3) = 195[/tex]
⇒ [tex]8x + (5 \times 2x) + (5 \times 3) = 195[/tex] [Distributing 5 into the brackets]
⇒ [tex]8x + 10x + 15 = 195[/tex]
⇒ [tex]18x + 15 = 195[/tex]
⇒ [tex]18x + 15 - 15 = 195 - 15[/tex] [Subtracting 15 from both sides of equation]
⇒ [tex]18x = 180[/tex]
⇒ [tex]\frac{18}{18}x = \frac{180}{18}[/tex] [Dividing both sides of equation by 18]
⇒ [tex]x = \bf 10[/tex]
Therefore, the value of x is 10.
What is the value for
y
in the equation
y
=
x
2
when
x
=
3
?
The ratio of dogs to cats are at the kennel is 3:2. there are 20 total dogs and cats at the kennel. how many dogs are at the kennel?
Answer:
12 dogs
Step-by-step explanation:
Ratios are scaleable, so let's look at all of the equivalent ratios of 3:2. However it needs to add up to 20 (the sum will be in parenthesis)
3:2 (Sum of 5)
6:4 (Sum of 10)
9:6 (Sum of 15)
12:8 (Sum of 20) ----> Correct Answer
I cant find my answer please help!
Step-by-step explanation:
we are calculating miles.
when we have speed, which is mph or miles/hour. what do we have to multiply it with to get miles ? hours !
miles/hour × hour = miles
so, in the function D(x) the speed 60 mph has to be multiplied by the hours spent driving to get the driven miles.
x = hours spent driving
the domain is the interval or set of all valid x (input) values. the range is the interval or set of all valid y (function result) values.
so what are valid x (number of driving hours) values ?
it starts with 0, if course (before actually driving). and it goes up to 4 (after 4 hours the 240 miles are "done").
the domain is
0 <= x <= 4
and the range ? that is all the function result values for the valid x values.
for x = 0 this starts at 240.
and goes down for x = 4 to 0.
the range is
0 <= y (= D(x)) <= 240
the radian measure of an angle theta is the length of the arc correct: your answer is correct. that subtends the angle in a circle of radius
We know that an arc is a part of the entire perimeter of a circle.
Radian is defined as a unit of plane angular measurement that is equal to the angle subtended by the circle at the center by an arc that is of the length equal to the radius
We also know that the circle as a whole contains 2π radians
we know that s=rΘ
S=rθ represents the central angle in radians and r is the length of the radius.
Thus we can say that radian measure of an angle theta is the length of the arc.
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The pawpaw shown has the same mass as the total mass of 8 mangoes of the same size. An orange has 2/5 the mass of a mango. What is the mass, in kilograms, of 3 mangoes and 5 oranges together?
The mass of 3 mangoes and 5 oranges together is 5x kg.
Let the mass of mangoes be 'x'
Given the total mass that pawpaw has = a total mass of 8 mangoes
= 8x
mass of an orange = 2/5 the mass of a mango
= 2/5 * x
Now, the mass of 3 mangoes and 5 oranges together as
= 3 * mass of mangoes + 5 * mass of orange
= 3 * x + 5 * 2/5 * x
= 3x + 2x
= 5x kg
The mass of 3 mangoes and 5 oranges together is 5x kg.
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(2am³n) (-3am⁴)
pa sagot. thanks
Answer:
if you just want to simplify, -6a^2 m^7 n
Step-by-step explanation:
Mother, who went to the market with Rs 500 in hand, spent Rs 300 to buy vegetables and Rs 150 to buy fruits. (i) What fraction of the money in hand did she spend on vegetables?
Answer:
3/5
Step-by-step explanation:
500 is the money she started with if you put that over the money she spent on vegetables it would be 300/500 when simplified it's 3/5
1. At 2 p.m., a car is 100 km east of Toronto, driving eastward at 80 km/h. A truck leaves Toronto at 2 p.m. and is driving eastward at 120 km/h. At what time will the truck pass the car? How far east of Toronto will they be when this occurs?
The time at which the truck will pass the car is 2.5 hours and the distance at which the car and truck meet is 200km.
What is velocity?Velocity is defined as the ratio of the distance moved by the object at a particular time. The velocity is a vector quantity so it needs both the magnitude and the direction.
Given that at 2 p.m., a car is 100 km east of Toronto, driving eastward at 80 km/h. A truck leaves Toronto at 2 p.m. and is driving eastward at 120 km/h.
The time will be calculated as:-
Relative velocity = Distance / Time
Time = Distance / Relative velocity
Time = 100 / 120 - 80
Time = 2.5 Hours
Distance of car = Speed x time = 80 x 2.5
Distance of car = 80 x 2.5
Distance of car = 200 Km
Therefore, the time at which the truck will pass the car is 2.5 hours and the distance at which the car and truck meet is 200km.
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send help guys thanks
The solutions associated with each case are listed below:
3 · x + 22 - x2 · x² + 4 · x1 / 2 + 1 / x2 · x + 22 · x + 4x + 44 · x- 82How to use operations between functions and evaluate resulting expressionsAccording to the statement, we find that the two functions are f(x) = x + 2 and g(x) = 2 · x and we are asked to perform on the functions to obtain all resulting expressions and, if possible, to evaluate on each case:
Case 1
(f + g) (x) = f (x) + g (x) = (x + 2) + 2 · x = 3 · x + 2
Case 2
(f - g) (x) = f (x) - g (x) = (x + 2) - 2 · x = 2 - x
Case 3
(f · g) (x) = f (x) · g (x) = (x + 2) · (2 · x) = 2 · x² + 4 · x
Case 4
(f / g) (x) = f (x) / g (x) = (x + 2) / (2 · x) = 1 / 2 + 1 / x
Case 5
(f ° g) (x) = f [g (x)] = 2 · x + 2
Case 6
(g ° f) (x) = g [f (x)] = 2 · (x + 2) = 2 · x + 4
Case 7
(f ° f) (x) = f [f (x)] = (x + 2) + 2 = x + 4
Case 8
(g ° g) (x) = g [g (x)] = 2 · (2 · x) = 4 · x
Case 9
(g ° g) (- 2) = 4 · (- 2) = - 8
Case 10
(f ° f) (- 2) = - 2 + 4 = 2
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Jillion exercise 5 times a week. She runs 3 miles each morning and bikes in the evening. If she exercises a total of 30 miles for the week, how many miles does she bike each evening?
Answer: 3 miles
Step-by-step explanation:
Total = 30 miles per week
Weekly runs in the morning= 3*5 = 15 miles per week
Bikes= 30-15 = 15 miles per week
Bikes each day= 15/5 = 3 miles
1 < x + 4 ≤ 4
please help me it’s due at 3:30
Answer:
−3 < x ≤ 0
Step-by-step explanation:
1 < x + 4 ≤ 4
Add -4 to all parts
1 + −4< x + 4 + −4 ≤ 4 + −4
Put pairs in bracket to avoid confusion
(1 + −4) < x (+ 4 + −4) ≤ (4 + −4)
−3 < x ≤ 0
The table below shows how much Joe earns, y, after working x hours.
Joe’s Earnings
Hours worked
Money earned
4
$30
10
$75
12
$90
22
$165
The relationship between money earned and hours worked is linear. Joe computes the slope between (4, 30) and (12, 90), then computes the slope between (4, 30) and (10, 75). How do the two slopes compare?
The slope between (4, 30) and (12, 90) is greater because the ordered pairs are farther apart on the x-axis.
The slope between (4, 30) and (12, 90) is greater because the ordered pairs are farther apart on the y-axis.
The slope between (4, 30) and (12, 90) and between (4, 30) and (10, 75) is the same.
The slope between (4, 30) and (12, 90) is less because 4 is a factor of 12 and 30 is a factor of 90.
The slope between (4, 30) and (12, 90) and between (4, 30) and (10, 75) is the same.
What is slope?Slope is the 'steepness' of the line, also commonly known as rise over run. slope is dividing the change in the y-value between two points over the change in the x-value.
given co-ordinates:
(4, 30), (10, 75), (12, 90), (22, 165)
Now, the slope between (4, 30) and (12, 90)
m= ( 90-30)/ (12-4)
m= 60 / 8
m = 7.5
and, the slope between (4, 30) and (10, 75)
m= ( 75-30)/ (10-4)
m=45 / 6
m= 7.5
Hence, The slope between (4, 30) and (12, 90) and between (4, 30) and (10, 75) is the same.
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Find the quotient of 4 4/5 divided 4/5. Explain how you can use the GCF to write your answer I. Simplest form.
Answer:
5/4 Quotient[24/5] and 6
Step-by-step explanation:
5/4 Quotient[24/5]
Simplify the following:
(4 + 4/5)/(4/5)
Multiply the numerator of (4 + 4/5)/(4/5) by the reciprocal of the denominator. (4 + 4/5)/(4/5) = ((4 + 4/5)×5)/4:
((4 + 4/5)×5)/4
Put 4 + 4/5 over the common denominator 5. 4 + 4/5 = (5×4)/5 + 4/5:
(((5×4)/5 + 4/5) 5)/4
5×4 = 20:
((20/5 + 4/5)×5)/4
20/5 + 4/5 = (20 + 4)/5:
(((20 + 4)/5)×5)/4
20 + 4 = 24:
(24/5×5)/4
24/5×5 = (24×5)/5:
((24×5)/5)/4
((24×5)/5)/4 = (24×5)/(5×4):
(24×5)/(5×4)
(24×5)/(5×4) = 5/5×24/4 = 24/4:
24/4
The gcd of 24 and 4 is 4, so 24/4 = (4×6)/(4×1) = 4/4×6 = 6:
Answer: 6
I’m so confused can anyone help me?
Answer:
Following is the answer for your question your question can be done in this manner.
Write the equation of a quadratic with the vertex at (2,-3) and passing through the point (6,4)
[tex]\displaystyle\\Answer:\ y=\frac{7}{16}x^2 -\frac{7}{4}x-\frac{5}{4}[/tex]
Step-by-step explanation:
The vertex is also the symmetry point of the parabola. The formula for finding the x-coordinate of the parabola: x = -b/2a (2,-3)
Hence,
[tex]\displaystyle\\2=\frac{-b}{2a} \\[/tex]
Multiply both parts of the equation by -2a:
[tex]\displaystyle\\-4a=b\ \ \ \ \ (1)[/tex]
[tex]y=ax^2+bx+c\ \ \ \ \ -\ \ \ \ \ the\ quadratic\ equation\\\\Thus,[/tex]
You can make a system of equations on two points belonging to the quadratic equation:
[tex]-3=a(2)^2+b(2)+c\\4=a(6)^2+b(6)+c\\\\-3=4a+2b+c\ \ \ \ (2)\\4=36a+6b+c\ \ \ \ (3)\\\\[/tex]
Substitute (1) into equations (2) and (3):
[tex]-3=4a+2(-4a)+c\\4=36a+6(-4a)+c\\\\-3=4a-8a+c\\4=36a-24a+c\\\\-3=-4a+c\ \ \ \ (4)\\4=12a+c \ \ \ \ (5)\\\\\\[/tex]
Subtract equation (4) from equation (5):
[tex]7=16a[/tex]
Divide both parts of the equation by 16:
[tex]\displaystyle\\\frac{7}{16} =a\ \ \ \ (6)[/tex]
Substitute (6) into equations (1):
[tex]\displaystyle\\-4(\frac{7}{16} )=b\\\\-\frac{4*7}{4*4}=b\\\\-\frac{7}{4}=b[/tex]
Substitute values a and b into equation (2):
[tex]\displaystyle-3=4(\frac{7}{16})+2(-\frac{7}{4})+c\\\\ -3=\frac{7}{4} -\frac{14}{4}+c\\\\ -3=-\frac{7}{4}+c \\\\-3+\frac{7}{4}=-\frac{7}{4}+c+\frac{7}{4} \\\\ \frac{-3*4+7}{4} =c\\\\\frac{-12+7}{4}=c\\\\ -\frac{5}{4}=c[/tex]
Thus,
[tex]\displaystyle\\y=\frac{7}{16}x^2 -\frac{7}{4}x-\frac{5}{4}[/tex]
Given the equation -12x+4y=12
a) solve for y if x=1
b) solve for y in general
Answer:
a) y = 6
b) y = 3x + 3
Step-by-step explanation:
a.)
plug 1 into x in the equation:
[tex]-12+4y=12[/tex]
add 12 to both sides to isolate 4y:
[tex]4y=24[/tex]
divide both sides by 4 to simplify x:
[tex]y=6[/tex] [24/4=6]
b.)
add 12x to both sides to isolate 4y:
[tex]4y=12x+12[/tex]
divide both sides by 4x to simplify x:
[tex]y=3x+3[/tex]
need help asap!
What will be the location of the x value of R' after using the translation rule (x + 4, y - 7), if the pre-image R is located at ( 24, -13)
Point R' is located at (28, -20)
=========================================================
Reason:
The translation rule is [tex](\text{x},\text{y})\to (\text{x}+4,\text{y}-7)[/tex]
It says to add 4 to the x coordinate, and subtract 7 from the y coordinate.
If we apply the rule to point R(24, -13), then we have...
[tex](\text{x},\text{y})\to (\text{x}+4,\text{y}-7)\\\\(24,-13)\to (24+4,-13-7)\\\\(24,-13)\to (28,-20)\\\\[/tex]
This rule shifts the point 4 units to the right and 7 units down.
One number is a lot more than another one.
Both numbers are greater than 100.
What could the two numbers be?
Select the correct answer.
An insurance data scientist is researching a certain stretch of a rural highway where drivers are never pulled over. The mile markers in the solution of the following inequality determines the conclusion of his research.
Solve and interpret the compound inequality, where x represents the mile marker along the highway.
2x − 18 ≥ 122 or 5x + 15 < 250
Drivers located below mile marker 47 or at mile marker 70 or above never get pulled over.
Drivers located between mile marker 46 and mile marker 71 never get pulled over.
Drivers located below mile marker 46 or at mile marker 71 or above never get pulled over.
Drivers located between mile marker 47 and mile marker 70 never get pulled over.
The correct interpretation regarding the solution of the compound inequality is given as follows:
Drivers located below mile marker 47 or at mile marker 70 or above never get pulled over.
How to solve a compound inequality involving the or operation?To solve a compound inequality involving the or operation, we solve each inequality, then apply the union operation to their solutions.
In this problem, the following inequalities help us find the miles x in which the drivers are never pulled over.
2x - 18 ≥ 122.5x + 15 < 250.The solutions are found as follows:
2x - 18 ≥ 122
2x ≥ 140
x ≥ 140/2
x ≥ 70.
5x + 15 < 250.
5x < 235
x < 235/5
x < 47.
Hence the correct option is given by:
Drivers located below mile marker 47 or at mile marker 70 or above never get pulled over.
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{(2,-4),(3,-4),(4,-4),(5,-4),(6,-4)}
Selena says that this relation represents a function. Jose says that it is not a function who do you agree with
Selena is right. This relation represents a function.
The set of points given is {(2,-4),(3,-4),(4,-4),(5,-4),(6,-4)}.
We can consider 2, 3, 4, 5, 6 as x-values and -4 as the y-value.
Here, the values 2, 3, 4, 5, 6 are related to -4.
This relation represents a function.
Because no two same x-values are related to different y-values. In other words, different x-values can be mapped to same y-value. But two same x-values should not be related to different y-values for the map to be a function.
So here all the x-values are related to the y-value -4. So this is a many-to-one function.
Function is a relation which maps a particular set of points(Domain) to another set of values(Codomain) through which one domain value has exactly one image in the co-domain.
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15. You have a part-time job after school. You work three hours after
school on Monday, Wednesday, and Friday. On Saturday you babysit and
earn an additional fifteen dollars and are given your weekly allowance of
twenty dollars on Sunday. You made a total of $100.25 this week, how
much money are you paid per hour at your part-time job?
Answer:
$100.25 total
100.25-15-20= $65.25 total for three days
For three Dayan three hours so 3*3 = 9 hrs total
65.25/9=7.25
Hence per hour $7.25
Step-by-step explanation:
statistical power is influenced by all of the following except . a. significance error b. critical value level
Statistical power is influenced by all of the following except observed test value.
What is statistical power?
If there is a real effect present to detect, the statistical power of a hypothesis test is the likelihood of finding it. When an experiment is complete, power may be calculated and presented to make comments about how confident one could be in the conclusions taken from the study's results. It may also be employed as a tool to calculate the sample size or the number of observations needed to detect an effect in an experiment. You will learn the significance of a hypothesis test's statistical power in this lesson, and you'll learn how to compute power analyses and power curves as part of an experimental design.
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Un granjero coloco una cerca al rededor de su parcela. La parcela mide 10 m de cada lado ya que es un cuadrado. Si puso los postes cada 3/4 de metro ¿cuantos postres coloco?
Greetings from Brasil...
The total length will be: 10+10+10+10 = 40
and
(3/4)m = 0.75m
Then, Rule of 3:
QTD m
1 ------ 3/4
X ------ 40
X = 53.333
Soon 53 posts will be needed
What is the correct form of the partial fraction decomposition for the expression 7x+18/x^2+9x
a StartFraction A Over x squared + StartFraction B Over 9 x EndFraction
b StartFraction A Over x EndFraction + StartFraction B Over x + 9 EndFraction
c StartFraction A x + B Over x squared EndFraction + StartFraction C Over 9 x EndFraction
d StartFraction A x + B Over x EndFraction + StartFraction C Over x + 9 EndFraction
The correct form of the partial fraction decomposition for given expression 7x+18/x^2+9x is A/x + B/(x + 9)
The correct answer is an option(B)
In this question, we have been given an expression x² + 9x = x (x + 9),
We need to write the correct form of the partial fraction decomposition for given expression.
Suppose, (7x + 18) / (x² + 9x) = A/x + B/(x + 9)
where A and B are some constants.
To find them, multiply both sides by x² + 9x :
7x + 18 = A (x + 9) + Bx
and then we solve for A and B.
Therefore, the correct form of the partial fraction decomposition for given expression 7x+18/x^2+9x is A/x + B/(x + 9)
The correct answer is an option(B)
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Answer:
The correct answer is option B
Step-by-step explanation:
the volume of right circular cylinder a is 22 cubic centimeters. what is the volume, in cubic centimeters, of a right circular cylinder with twice the radius and half the height of cylinder a?
The new volume of the right circular cylinder is 44 cubic centimeter.
The formula for the volume of the cylinder is given as
V = Πr^2h (1)
We have been given that, V = 22 cubic centimeters
Now we need to find the volume of the cylinder which is denoted by V’ whose,
r = 2r
and, h = h/2
Now putting the required values in equation (1) we get
V’ = Π(2r)^2(h/2)
V’ = Π4r^2(h/2)
V’ = 4/2(Πr^2h)
V’ = 2V [as V = Πr^2h]
V’ = 2*22 cubic centimeter
V’ = 44 cubic centimeter
Hence the new volume of the right circular cylinder is 44 cubic centimeter
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Mary will rent a car for the weekend she can choose one or two plans the first plane has it in initial fee of $55 and cost an additional $0.12 per mile driven the second plan has an initial fee of $50 in cost an additional $0.17 per mile driven
By using the concept of linear equations, amount of driving when two of these plans cost the same will be at x = 100.
The cost when two plans cost the same is $67.
What is Linear Equation in one variable?The linear equation in one variable is written as ax + b = 0, where a and b are two integers and x is a variable. This equation has only one solution.
Given data:
First plan has it in initial fee of $55 and cost an additional $0.12 per mile.
Second plan has an initial fee of $50 in cost an additional $0.17 per mile.
Linear Equation for first plan: f(x) = 55+0.12x
Linear Equation for second plan: s(x) = 50+0.17x
Here, x is a variable.
To find out the distance when the two plans cost the same, we'll need to solve:
55 + 0.12x = 50 + 0.17x
55 - 50 = 0.17x- 0.12x
5 = 0.05x
x = 5/0.05
x = 100
The cost when the two plans cost the same :
f(100) = 55 + 0.12(100)
f(100) = $67
s(100) = 50 + 0.17(100)
s(100) = $67
Hence, two of the plans will cost the same at x=100 and cost will be $67.
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i hope someone can help me here, please don't answer nonsense!
Answer:
f(6) = 5f(a) = 15/(a -3)Step-by-step explanation:
You want to find f(6) and f(a) when f(x) = 15/(x -3).
SubstitutionTo evaluate a function, put the argument where the variable is and simplify as needed.
F(6)Put 6 where x is:
f(6) = 15/(6 -3) = 15/3
f(6) = 5
F(a)Put 'a' where x is:
f(a) = 15/(a -3) . . . . . . cannot be simplified
5 plus 5 equals what?
Answer: 10
Step-by-step explanation: 1 1 1 1 1+ 1 1 1 1 1= 1 1 1 1 1 1 1 1 1 1 or 10