Answer:
Step-by-step explanation:
We can use the formula for continuous compounding to determine how long it will take each account to reach $1,800.
For Michael's account, the formula is:
A = P*e^(rt)
where:
A is the amount in the account after t years
P is the principal
r is the annual interest rate
t is the time in years
Plugging in the values given, we get:
1,800 = 1,000*e^(0.0475t)
Taking the natural logarithm of both sides, we get:
ln(1,800/1,000) = 0.0475t
t = ln(1,800/1,000)/0.0475
t ≈ 8.55 years
So it will take approximately 8.55 years for Michael's account to reach $1,800.
Similarly, for Peter's account, the formula is:
A = P*e^(rt)
where:
A is the amount in the account after t years
P is the principal
r is the annual interest rate
t is the time in years
Plugging in the values given, we get:
1,800 = 1,200*e^(0.0425t)
Taking the natural logarithm of both sides, we get:
ln(1,800/1,200) = 0.0425t
t = ln(1,800/1,200)/0.0425
t ≈ 9.03 years
So it will take approximately 9.03 years for Peter's account to reach $1,800.
Therefore, Michael's account will grow to $1,800 first as it will take less time (8.55 years) compared to Peter's account (9.03 years).
Find relative extrema (x, y) of a function h(x) = x^3 + 3x^2 − 2 using
(a) the first derivative test
(b) the second derivative test
Which test is easiest?
a) Based on the first derivative test, h(x) has a relative minimum at x = -2 and a relative maximum at x = 0.
b) For x = -2: h''(-2) = 6(-2) + 6 = -6 < 0, so h(x) has a relative maximum at x = -2.
For x = 0: h''(0) = 6(0) + 6 = 6 > 0, so h(x) has a relative minimum at x = 0.
What is the calculus?Calculus is a branch of mathematics that deals with the study of rates of change, accumulation, and the properties and behavior of functions.
(a) First derivative test:
The first derivative test involves finding the critical points of the function, where the first derivative is equal to zero or undefined, and then checking the sign of the first derivative in the intervals between the critical points to determine whether the function has relative extrema at those points.
Find the first derivative of h(x):
h'(x) = 3x² + 6x
Set h'(x) = 0 and solve for x to find the critical points:
3x² + 6x = 0
x(x + 2) = 0
x = 0 or x = -2
Test the intervals between the critical points using the sign of the first derivative:
For x < -2: Choose x = -3, h'(-3) = 27 + (-18) = 9 > 0, so h(x) is increasing.
For -2 < x < 0: Choose x = -1, h'(-1) = 3 - 6 = -3 < 0, so h(x) is decreasing.
For x > 0: Choose x = 1, h'(1) = 3 + 6 = 9 > 0, so h(x) is increasing.
Based on the first derivative test, h(x) has a relative minimum at x = -2 and a relative maximum at x = 0.
(b) Second derivative test:
The second derivative test involves finding the critical points of the function using the first derivative, and then checking the sign of the second derivative at those points to determine whether the function has relative extrema at those points.
Find the second derivative of h(x):
h''(x) = 6x + 6
Evaluate the second derivative at the critical points found in step 2 of the first derivative test:
For x = -2: h''(-2) = 6(-2) + 6 = -6 < 0, so h(x) has a relative maximum at x = -2.
For x = 0: h''(0) = 6(0) + 6 = 6 > 0, so h(x) has a relative minimum at x = 0.
Hence, the ease of a test may vary for different individuals and their familiarity with calculus concepts.
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Which statement concerning the equation x² - 1 = x is true?
Its discriminant is 0, so it has no solution.
Its discriminant is 5, so it has two real solutions.
Its discriminant is 0, so it has one real solution.
Its discriminant is -3, so it has two complex solutions.
The quadratic equation is solved and discriminant is 5, so it has two real solutions
Given data ,
The given equation is a quadratic equation in the standard form ax² + bx + c = 0, where a = 1, b = -1, and c = -1
The discriminant of a quadratic equation is given by b² - 4ac. So, the discriminant of the given equation is
(-1)² - 4(1)(-1) = 1 + 4 = 5
Since the discriminant is positive (not zero or negative), the equation has two real solutions.
Hence , its discriminant is 5, so it has two real solutions
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Help me to understand it
a. The dependent variable is the number of unit sold. The independent variable is price.
b. The value of r is -0.9965
c. ŷ = -0.68688X + 56.95837
How to find r using tablesX Values
∑ = 301
Mean = 50.167
∑(X - Mx)2 = SSx = 920.833
Y Values
∑ = 135
Mean = 22.5
∑(Y - My)2 = SSy = 437.5
X and Y Combined
N = 6
∑(X - Mx)(Y - My) = -632.5
R Calculation
r = ∑((X - My)(Y - Mx)) / √((SSx)(SSy))
r = -632.5 / √((920.833)(437.5)) = -0.9965
Meta Numerics (cross-check)
r = -0.9965
c. Regression line calculation
Sum of X = 301
Sum of Y = 135
Mean X = 50.1667
Mean Y = 22.5
Sum of squares (SSX) = 920.8333
Sum of products (SP) = -632.5
Regression Equation = ŷ = bX + a
b = SP/SSX = -632.5/920.83 = -0.68688
a = MY - bMX = 22.5 - (-0.69*50.17) = 56.95837
ŷ = -0.68688X + 56.95837
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how many times greater is 4x10^2 than 10^4
Answer:
well 10^4 is 10000, and 4x10^2 is 1600 and if we divide 10000 by 1600 we can find out how many times greater 10000 is than 1600, and the anwser is 6.25
Step-by-step explanation:
Find the surface area of the triangular prism. A triangular prism. The base is a right triangle with base and height 4 millimeters, and the third side 5.7 millimeters. The height of the prism is 3 millimeters.
The surface area of the triangular prism is approximately 44.29 square millimeters.
What is surface area?
Surface area is the total area that the surface of a three-dimensional object covers. It is a measure of the amount of space that the surface of an object occupies. Surface area is usually measured in square units such as square meters, square centimeters, square inches, or square feet.
What is the area?
The total space occupied by a flat (2-D) surface or the shape of an object is defined as its area.
The area of a plane figure is the space enclosed by its boundary.
According to the given information:
To find the surface area of a triangular prism, we need to add up the area of all the faces. A triangular prism has three rectangular faces and two triangular faces.
Let's start by finding the area of the triangular faces. The base of the triangular prism is a right triangle with base 4 millimeters, height 4 millimeters, and hypotenuse 5.7 millimeters. We can use the Pythagorean theorem to find the missing side:
[tex]a^2 + b^2 = c^2\\4^2 + 4^2 = 5.7^2[/tex]
16 + 16 = 32.49
32 = 32.49 - 0.49
32 = 32
So the missing side has length [tex]\sqrt{(5.7^2 - 4^2)} =3.69 millimeters.[/tex] This is the base of each triangular face.
The height of the triangular prism is 3 millimeters, so the height of each triangular face is also 3 millimeters.
The area of each triangular face is:
(1/2) × base × height
= (1/2) × 3.69 × 3
≈ 5.54 square millimeters
So the total area of the two triangular faces is:
2 × 5.54= 11.08 square millimeters
Now let's find the area of each rectangular face. The length of each rectangular face is the same as the base of the triangular face, which is 3.69 millimeters. The width of each rectangular face is the height of the triangular prism, which is 3 millimeters.
The area of each rectangular face is:
length × width
= 3.69 × 3
≈ 11.07 square millimeters
So the total area of the three rectangular faces is:
3 × 11.07
= 33.21 square millimeters
To find the surface area of the triangular prism, we add up the area of all five faces:
11.08 + 33.21
= 44.29 square millimeters
Therefore, the surface area of the triangular prism is approximately 44.29 square millimeters.
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Find m so that x + 5 is a factor of - 3x^4 - 10x^3 + 20x^2 - 22x + m.
If x + 5 is a factor of the given polynomial, then (x + 5) must divide the polynomial evenly, meaning that the remainder is 0 when the polynomial is divided by x + 5.
We can use polynomial long division or synthetic division to find the quotient and remainder, but it's easier to use the fact that if x + 5 is a factor, then (-5) must be a root of the polynomial.
So, we can substitute x = -5 into the polynomial and set it equal to 0 to find m:
-3(-5)^4 - 10(-5)^3 + 20(-5)^2 - 22(-5) + m = 0
Simplifying and solving for m:
-3(625) + 10(125) + 20(25) + 110 + m = 0
-1875 + 1250 + 500 + 110 + m = 0
m = 1015
Therefore, m = 1015 so that x + 5 is a factor of - 3x^4 - 10x^3 + 20x^2 - 22x + m.
Suppose that the weight (in pounds) of an airplane is a linear function of the amount of fuel (in gallons) in its tank. When carrying 14 gallons of fuel, the airplane weighs 2091 pounds. When carrying 48 gallons of fuel, it weighs 2312 pounds. How much does the airplane weigh if it is carrying 52 gallons of fuel?
The airplane weigh if it is carrying 52 gallons of fuel will be, 2338 pounds
Let,
Weight of airplane = y
Amount of fuel = x
The general linear equation can be written as, y=mx + c, where, (m) is slope, and (c) is a constant.
It is given,
2091 = 14m + c ..... (1)
2312 = 48m + c ..... (2)
On subtracting, (1) with (2), we get
221 = 34m
m= (221/34)= 6.5
Now, on putting the value of (m) in (1), we get,
2091 = 14(6.5) + c
So,
c = 2000
Therefore, the linear equation can be written as,
y = (6.5)mx + 2000
Now to find the airplane weight at 52 gallons of fuel, we put x = 52, to find y.
That is,
y = (6.5)(52) + 2000
y = 2338
So, the airplane weigh if it is carrying 52 gallons of fuel will be, 2338 pounds.
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for each pair of lines determine whether they are parallel, perpendicular, or neither
Answer:
All lines are parallel.
Step-by-step explanation:
Get each equation in Slope-Intercept form:
1. Divide both sides by 3: [tex]y=-\frac{4}{3}x+\frac{7}{3}[/tex]
2. No change
3. Subtract 8x and divide by 6 on both sides: [tex]y=-\frac{4}{3}x-\frac{2}{3}[/tex]
Notice:
a. All slopes are -4/3
b. All y-intercepts are different
Solve for x. Round to the nearest tenth, if necessary.
x = 3.6 units
Step-by-step explanation:First, some definitions before working the problem:
The three standard trigonometric functions, cosine, tangent, and sine, are defined as follows for right triangles:
[tex]sin(\theta)=\dfrac{opposite}{hypotenuse}[/tex]
[tex]cos(\theta)=\dfrac{adjacent}{hypotenuse}[/tex]
[tex]tan(\theta)=\dfrac{opposite}{adjacent}[/tex]
One memorization tactic is "Soh Cah Toa" where the first capital letter represents one of those three trigonometric functions, and the "o" "a" and "h" represent the "opposite" "adjacent" and "hypotenuse" respectively.
The triangle must be a right triangle, or there wouldn't be a "hypotenuse", because the hypotenuse is always across from the right angle.
Working the problem
For the given triangle, the right angle is in the top right, so the side on the bottom left is the hypotenuse.
We know the angle in the lower right corner (angle S), so the side touching it (side ST) with unknown length is the adjacent side. (notice that the points that form the side include the vertex of the angle -- so, it's the adjacent side).
For this triangle, the "adjacent" leg is unknown, our "goal to find" side. Additionally, the "hypotenuse" is known.
Therefore, the two sides of the triangle that are known or are a "goal to find" are the "adjacent" & "hypotenuse".
Out of "Soh Cah Toa," the part that uses "a" & "h" is "Cah". So, the desired function to use for this triangle is the Cosine function.
[tex]cos(\theta)=\dfrac{adjacent}{hypotenuse}[/tex]
[tex]cos(69^o)=\dfrac{x}{10}[/tex]
To isolate "x", multiply both sides by 10...
[tex]10*cos(69^o)=x[/tex]
Make sure your calculator is set to degree mode, and calculate:
[tex]10*(0.3583679495453...)=x[/tex]
[tex]x=3.583679495453...[/tex] units
Rounded to the nearest tenth...
x = 3.6 units
Graph the linear equation y=-3x-1
Answer:
Step-by-step explanation:
y=-3x-1
format for formula:
y=mx+b
b=1 that is your y-intercept. where it hits the y-axis
m= -3 this is your slope [tex]\frac{rise}{run} =\frac{-3}{1}[/tex]
from a point you have, the y-intercept, you go down 3 (because of the negative in front of it), this is your rise,
and to the right 1, this is your run
A culture started with 3,000 bacteria. After 4 hours, it grew to 3,600 bacteria. Predict how many bacteria will be present after 10 hours.
Round your answer to the nearest whole number.
P = Aekt
Answer:
Step-by-step explanation:
To predict the number of bacteria after 10 hours using the formula P = Aekt, where P is the final population, A is the initial population, k is the growth rate, and t is the time elapsed, we need to first find the value of k.
dw
We know that after 4 hours, the population grew from 3,000 bacteria to 3,600 bacteria. So we can set up an equation:
3,600 = 3,000e^(4k)
Dividing both sides by 3,000 gives:
1.2 = e^(4k)
Taking the natural logarithm of both sides gives:
ln(1.2) = 4k
Solving for k, we get:
k = ln(1.2)/4
k ≈ 0.051
Now that we have the value of k, we can use the formula to predict the number of bacteria after 10 hours:
P = 3,000e^(0.051*10)
P ≈ 5,426
Therefore, we predict that after 10 hours, there will be approximately 5,426 bacteria present in the culture.
Danielle got 23 out of 25 points on her math test. What percent of questions did she get correct?
To calculate the percentage of questions Danielle got correct on her math test, we can divide the number of questions she got correct by the total number of questions on the test and then multiply by 100. In this case, Danielle got 23 out of 25 questions correct, so we can calculate her percentage as follows: (23/25) * 100 = 92%. Therefore, Danielle got 92% of the questions correct on her math test.
Percent = amount per 100
23/25 = amount per 25
25 x 4 = 100
23 x 4 = 92
92/100 = 92%
Answer = 92%
Hope this helps!
Select the expression that is less than 10 2/3.
A. 10 2/3 x 9/10
B. 1 x 10 2/3
C. 10 2/3 x 2 1/3
D. 2 1/8 x 10 2/3
Answer:
A
Step-by-step explanation:
Correct answer gets brainliest
Answer:
D. its a two dimensional object
Answer:
A. It is a polygon
C. It is a one-dimensional object
The shape is a polygon in two dimensions since a polygon must have at least three straight sides.
use synthetic division
PLEASE HELP 30 PTS
Answer:
The quotient is
[tex]8 {x}^{2} + 15x - \frac{1}{8} [/tex]
and the remainder is
[tex] \frac{63}{64} [/tex]
Showing all work solve for x and y in this special right triangle
Answer:
x = 4√3
y = 8√3
Step-by-step explanation:
The interior angles of the given right triangle are 30°, 60° and 90°.
Therefore, the triangle is a special 30-60-90 triangle.
In a 30-60-90 triangle, the measures of its sides are in the ratio 1 : √3 : 2.
Therefore, the formula for the ratio of the sides is b : b√3 : 2b where:
b is the shortest side opposite the 30° angle.b√3 is the side opposite the 60° angle.2b is the longest side (hypotenuse) opposite the right angle.From inspection of the given triangle, the side opposite the 60° angle is 12 units in length. Therefore:
[tex]b\sqrt{3} = 12[/tex]
Solve the equation for b:
[tex]\begin{aligned}b&=\dfrac{12}{\sqrt{3}}\\\\b&=\dfrac{12 \cdot \sqrt{3}}{\sqrt{3} \cdot \sqrt{3}}\\\\b&=\dfrac{12\sqrt{3}}{3}\\\\b&=4\sqrt{3}\end{aligned}[/tex]
"x" is the side opposite the 30° angle. Therefore:
[tex]\begin{aligned}x& = b\\x& = 4\sqrt{3}\end{aligned}[/tex]
"y" is the side opposite the right angle. Therefore:
[tex]\begin{aligned}y&=2b\\y&=2 \cdot 4\sqrt{3}\\y&=8 \sqrt{3}\end{aligned}[/tex]
Therefore, the values of x and y are:
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Compare each pair of expressions using >, <, or =.
.-32
. |-32|
5 -5
15
___|15|
. |5|_____|-5|
2-17
▾
2 ____ |-17|
. |-27|_____|-45|
.-27______-45
Comparing each pair of expressions using >, <, or = is given below:
15 > |___15| (because |___15| is equal to 15)2 - 17 < ▾ (because 2 - 17 equals -15, which is less than the square root symbol)-27 > -45 (because -27 is closer to zero than -45)'How to solve-32 < |-32| (because -32 is negative and |-32| is positive)
5 - 5 = 0 (because subtracting the same number results in zero)
15 > |___15| (because |___15| is equal to 15)
|5| = |___|-5|| (because both expressions are equal to 5)
2 - 17 < ▾ (because 2 - 17 equals -15, which is less than the square root symbol)
2 > |____|-17|| (because 2 is positive and |-17| is also positive)
|-27| > ||-45|| (because |-27| is 27 and ||-45|| is 45)
-27 > -45 (because -27 is closer to zero than -45)
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the probability of rolling a 4 or an even number of the die is thrown 2 times. (6 sided dice)
The probability of rolling a 4 on a single throw of a fair 6-sided die is 1/6, since there is only one way to roll a 4 and there are 6 equally likely outcomes in total.
The probability of rolling an even number on a single throw of a fair 6-sided die is 3/6, or 1/2, since there are three even numbers (2, 4, and 6) out of six possible outcomes.
To find the probability of rolling a 4 or an even number on a single throw, we can add the probabilities of these two events:
P(4 or even) = P(4) + P(even) - P(4 and even)
where P(4 and even) is the probability of rolling a 4 and an even number on the same throw. Since there is only one outcome (rolling a 4), which is not even, this probability is 0.
Therefore:
P(4 or even) = P(4) + P(even) - P(4 and even)
= 1/6 + 1/2 - 0
= 2/3
So the probability of rolling a 4 or an even number on a single throw of a 6-sided die is 2/3.
If the die is thrown 2 times, the probability of rolling a 4 or an even number on both throws is the product of the probabilities of rolling a 4 or an even number on each throw:
P(4 or even on both throws) = P(4 or even) × P(4 or even)
= (2/3) × (2/3)
= 4/9
Therefore, the probability of rolling a 4 or an even number on both throws of a 6-sided die is 4/9.
Graph the line. y = 4x -2 Which of the following most closely matches your graph? Group of answer choices The line has a positive slope and passes through the x-axis at -2. It also passes through the point (2, 1). The line has a positive slope and passes through the y-axis at -2. It also passes through the point (1, 2). The line has a negative slope and passes through the y-axis at 4. It also passes through the point (2, 0). The line has a positive slope and passes through the y-axis at -2. It also passes through the point (4, -1).
"The line has a positive slope and passes through the x-axis at -2. Additionally, it crosses through point (2, 1).
What are the intercepts of the equation 2x = - 4?The formula in this case is 2x-y = -4. When we set the value of y to 0, we can use this equation to calculate the x-intercept: 2x0=42x=4. When we multiply both sides by 2, we obtain 2x2=42x=2. The x-intercept is therefore -2.
We may use the slope-intercept version of the equation, y = mx + b, where m is the slope and b is the y-intercept, to graph the line y = 4x - 2.
We can observe that the slope is m = 4 and the y-intercept is b = -2 by comparing y = 4x - 2 to y = mx + b.
Starting with the y-intercept of -2 on the y-axis, we can graph line by finding other points on it using the slope of 4.
To get to the point, if we move two units to the right, we must move up eight units. (2, 6). To get to the point, if we move two units to the left, we must move down eight units. (-2, -10).
According to the description and choices given, "The line has a positive slope and passes through the x-axis at -2" is the option that most closely matches our graph. Additionally, it crosses through point (2, 1).
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Construct a truth table for the statement (~ pVq) →q.
Here is the truth table for the statement (~ p V q) → q:
```
p q ~p ~p V q (~p V q) → q
---------------------------------------
T T F T T
T F F F T
F T T T T
F F T F T
```
In the table, `p` and `q` represent the truth values of the propositions `p` and `q`, respectively. The symbol `~` represents negation (i.e., "not"). The symbol `V` represents the logical connective "or" (i.e., "inclusive or"). The symbol `→` represents the conditional connective "implies" (i.e., "if...then").
To fill in the truth table, we first evaluate `~p` and `~p V q` for each combination of truth values for `p` and `q`. Then, we evaluate `(~p V q) → q` for each combination of truth values.
We can see that the statement is always true, regardless of the truth values of `p` and `q`, except for the case where `p` is true and `q` is false.
If f(5)=-1 , write a corresponding ordered pair solution
Answer: (5, -1)
Step-by-step explanation:
format: f(x)
in f(5)=-1 x=5
also sometimes f(x) is called y so y= -1
put into ordered pair format
(5, -1)
How to provide appropriate commentaries Thet will assist learners in the completing the sum of 8+(6-3)-9
Answer:
Step-by-step explanation:
8+(6-3)-9
The first action is addition in parentheses
(6-3) = 3
The second action is addition and then subtraction, you can subtract first and then add, it makes no difference because the answer will be the same in all cases
8 + 3 - 9 = 11 - 9 = 2
Which of the following represents vector w = ❬–27, 35❭ in linear form?
w = –27i + 35j
w = 27i – 35j
w = –35i + 27j
w = 35i – 27j
Answer: w = –27i + 35j
Step-by-step explanation:
What rate of interest, to the nearest tenth of a percent, compounded quarterly is needed for an investment of $1600 to grow to $2400 in 11 years
Compound interest is the interest earned on the principal and the interest previously accumulated. It is given by
[tex]A=P(1+r/n)^{nt}[/tex]
where P = Principal, r = annual rate of interest, n = the number of times interest is compounded per year & t = time in years.
The given principal is $1600 for 11 years & amount is $2400 compounded quarterly.
To find the rate of interest compounded quarterly for 11 years substitute the given values in the above formula i.e
[tex]2400=1600(1+r/4)^{11*4}[/tex]
r=3.70%.
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4. Which set of data could be represented by the box-and-whisker plot? (1 point)
O0, 3, 9, 9, 11, 14, 15, 16, 16, 18, 19, 25, 25, 28, 28, 30
O2, 3, 4, 7, 13, 15, 15, 15, 16, 17, 20, 22, 25, 25, 26, 28
O2, 6, 7, 8, 10, 11, 12, 14, 18, 20, 22, 24, 26, 27, 27, 28
O2, 2, 7, 10, 10, 11, 13, 15, 17, 20, 20, 24, 26, 27, 27, 28
A set of data that could be represented by the box-and-whisker plot include the following: D.
The median of the set of data is equal to 10.
What is a box-and-whisker plot?In Mathematics and Statistics, a box-and-whisker plot is a type of chart that can be used to graphically or visually represent the five-number summary of a data set with respect to locality, skewness, and spread.
Based on the information provided about the data set (2, 2, 7, 10, 10, 11, 13, 15, 17, 20, 20, 24, 26, 27, 27, 28), the five-number summary for the given data set include the following:
Minimum (Min) = 2.
First quartile (Q₁) = 16.
Median (Med) = 10.
Third quartile (Q₃) = 25.5.
Maximum (Max) = 28.
In conclusion, we can logically deduce that the median of the data set is 10 and it has no outlier.
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Which line is parallel to the line
and passes through the point (-2, 1)?
The equation of the line parallel is y = mx + (1 + 2m).
We have,
The equation of the line.
y = mx + c
Slope = m
And,
(-2, 1) = (x, y)
So,
1 = m x -2 + c
c = 1 + 2m
Now,
y = mx + c
y = mx + (1 + 2m)
Thus,
The equation of the line parallel is y = mx + (1 + 2m).
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Hello please I don't understand this exercise..
In an orthonormal frame (o; i; j), we give the points A(3; 1), B(1; 2) and the line (AC) with equation 2x-y-5=0.
1) Determine the equation of the line (AB).
2)a) Show that the direction vectors AB and AB of the lines (AC) and (AB) are orthogonal.
b) Then determine the coordinates of C.
The equation of the line AB,with slope of -1/2 is y = (-1/2)x + 7/2. We then use the dot product to show that the direction vectors of the lines AB and AC are orthogonal, and the coordinates of point C is (6,7).
In an orthonormal frame (o; i; j), the points A and B are given as A(3;1) and B(1;2), and the line (AC) is given by the equation 2x-y-5=0.
To determine the equation of line (AB), we need to find the slope (or gradient) of the line passing through A and B. We can find this by using the formula
slope = (y2 - y1) / (x2 - x1)
where (x1, y1) and (x2, y2) are the coordinates of two points on the line. Substituting the values of A and B, we get
slope = (2 - 1) / (1 - 3) = -1/2
Now that we have the slope, we can use the point-slope form of a line to find the equation of line (AB). Let (x,y) be any point on the line, then we have
y - 1 = (-1/2)(x - 3)
Simplifying, we get
y = (-1/2)x + 7/2
So the equation of line (AB) is y = (-1/2)x + 7/2.
To show that the direction vectors AB and AC of the lines (AB) and (AC) are orthogonal, we need to find the direction vectors of these lines and show that their dot product is zero. The direction vector of a line is just the vector that "points" in the direction of the line. To find it, we can take any two points on the line and subtract their coordinates to get a vector.
For line (AC), we can take A and C as two points on the line. Since we don't know the coordinates of C yet, we can solve the equation of line (AC) for x to get
x = (y + 5) / 2
Now substituting x by the above expression in the coordinates of point A we get
C((y + 5)/2, y)
Thus, the direction vector of line (AC) is
AC = C - A = ((y + 5)/2 - 3, y - 1) = (y/2 - 7/2, y - 1)
Similarly, we can take A and B as two points on the line (AB) to get the direction vector of line (AB):
AB = B - A = (1-3, 2-1) = (-2, 1)
Now, the dot product of AB and AC is
AB · AC = (-2)(y/2 - 7/2) + (1)(y - 1) = -y + 7
We can see that the dot product is zero when y=7. Hence, direction vectors AB and AC are orthogonal at point C(3,7).
To determine the coordinates of C, we substitute y=7 in the equation of line (AC) we obtained earlier
2x - y - 5 = 0
2x - 7 - 5 = 0
2x = 12
x = 6
Therefore, C has coordinates (6,7).
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if you are standing 350 feet away from a "1000" foot tall skyscraper, what angle of elevation is needed for you to look up and see the top of the building? when your angle of elevation is at 25 degrees you see your friend waving at the window. exactly how far apart are you?
Answer:
70.7°
350 feet
Im not too sure about the last one
The speed limit on the Princes Highway in Victoria is 100km/hour.
What is this speed limit, rounded to the nearest whole number, in m/s?
The speed limit for the highway in rounded to the nearest whole is 33 mi/h.
Unit ConversionThe speed is the ratio of the distance in a given time interval. The distance is represented by a unit of length and the time is represented by a unit of time.
There are different units for the length or distance. In the International System Units (SI), the standard unit of distance is the meter (m) and the standard unit of time is the second (s). Nonetheless, there are others units, for example: inches (in), miles (mi) and yards (yd).
For solving this exercise, you need to know the relation between the given units for distance and time.
The question gives - 100 km/h. The kilometer (km) is a multiple of the standard unit of distance - the meter (m) and the hour is a submultiple of the standard unit of time - the second (s)
For solving this question, it is necessary that you know the relation between km/h and mi/h. See below.
[tex]\text{1 km/h}= 0.6213712 \ \text{mi/h}[/tex]
Now you can solve the question from a math tool - Rule of three. Thus,
[tex]\text{1 km/h}= 0.6213712 \ \text{mi/h}[/tex]
[tex]100 \ \text{km/h}= \text{x mi/h}[/tex]
[tex]\text{x}= 100 \times 0.6[/tex]
[tex]\text{x}=33 \ \text{mi/h}[/tex]
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how many flowers spaced every 6 inches are needed to surround a circular garden with a 18-foot radius?
The number of flowers needed is 226
What is circumference of a circle?The circumference is the perimeter of a circle or ellipse. The circumference is the outer body of a circle and it can also be called perimeter of a circle.
The circumference of a circle is expressed as!
C = 2πr , where r is the radius.
the radius of the garden is 18ft
C = 2 × 3.14 × 18
C = 113.04
This means the perimeter of the garden is 113.04
For a space of 6 inches, the flower needed is calculated as;
113.04 × 12/6 ( since 1 foot is 12 inches)
= 113.04 × 2
= 226 flowers ( nearest whole number)
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