Determine the decimal of growth or decay.
7,545(0.96)^5

Answer: Your welcome!

Step-by-step explanation:

The slope of the line represents the amount of money that is donated each day, which is 25. The y-intercept represents the amount of money donated on the first day, which is 50.

The coordinates of the image of EB are (0, -1) and (-6, 18).

Dilation is a process for creating similar figures by changing the dimensions.

The center of dilation is given as (3, -1) and the scale factor is 3.

The distance between the center of dilation and point E is:

d = √((3-2)² + (-1-(-1))²) = 1

The distance between the center of dilation and point B is:

d = √((3-0)² + (-1-5)²) = sqrt(65)

To find the new distance, we multiply the distance by the scale factor:

For point E: 3 × 1 = 3

For point B: 3 × √(65)

Now, we can find the coordinates of the image:

For point E:

x = 3 × (2 - 3) + 3 = -3 + 3 = 0

y = 3 × (-1 -(-1)) -1 = 0 - 1 = -1

So the image of E is (0, -1).

For point B:

x = 3 × (0 - 3) + 3 = -9 + 3 = -6

y = 3 × (5 -(-1)) -1 = 18

So the image of B is (-6, 18).

Therefore, the coordinates of the image of EB are (0, -1) and (-6, 18).

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The length of the diagonal is between 4 - 5 and closer to 4

First, we need to know the properties of a rectangle;

Given that the diagonal measures;

√18

Find the value

4. 2

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Answer: 256

Step-by-step explanation: This is a rectangular prism and shows the length, width, and height, so we need to use the formula length times width times height. So 8 * 8 * 4 equals 256.

The required side length of the variable "x" is 12.8 units for the given figure.

When a line parallel to one side of a triangle intersects the other two sides in distinct spots, the other two sides are separated in the same ratio.

As we can see that both are similar quadrilaterals,

According to Thales's Theorem,

5:8 = 8:x

So, 5/8 = 8/x

Apply the cross-multiplication, and we get

5x = 8 × 8

x = 64/5

Apply the division operation, and we get

x = 12.8

Thus, the required side length of the variable "x" is 12.8 units.

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Answer:

1/24 hour

Step-by-step explanation:

2 1/2 minutes = 2.5 minutes

2.5/60 = 1/24 hour

Answer:

Either x/9 or 0.75 per cookie

Step-by-step explanation:

Let the number of cookies in a box be x.

The cost of x=9$

Then, the cost of one cookie= x/9

alternatively:

Considering one box contains 12 cookies,

The cost of a box of cookies= 9$

Then, the cost of one cookie= 9/12=0.75

To find the zeros, set the function equal to 0.  In other words, solve f(x)=0.

             f(x) = 0

x^2 +6x + 8 = 0

 (x+4)(x +2) = 0

x = -4 and x = -2

The vertex will happen when x = -b/2a:

    [tex]x=\dfrac{-6}{2(1)} = -3[/tex]
Then use this x-value of –3 to find the y-value of the vertex:

   y = (-3)^2 + 6(-3) + 8 = 9-18+8 = -1

The vertex is (-3,-1).

Side note: The x-value of the vertex can also be found by finding the average of the two zeros:

    (-4 + (-2)) / 2 = -6/2 = -3

The time taken for Ben's ball to land after Andrew's ball is 2.5 seconds.

To calculate the time taken for the Ben's ball to land after Andrews ball is calculated as follows;

Since the value of parameter a is -5 for both balls, the height of each ball follows the equation:

h(t) = -5t² + vt + h0

where;

Let's assume that Andrew's ball is hit with an initial velocity of v1, and Ben's ball is hit with an initial velocity of v₂. We also know that Ben's ball reaches a maximum height 50% greater than Andrew's, which means that:

h_max2 = 1.5h_max1

At the maximum height, the velocity of the ball is zero, so we can find the time it takes for each ball to reach the maximum height by setting v = 0 in the equation for h(t):

t_max1 = v₁ / (2 x 5)

t_max2 = v₂ / (2 x 5)

Since Ben's ball reaches a maximum height that is 50% greater than Andrew's, we can write:

h_max2 = 1.5h_max1

-5(t_max2)² + v₂t_max2 + h0 = 1.5(-5(t_max1)² + v1 * t_max1 + h0)

Simplifying this equation, we get:

-5(t_max2)² + v₂t_max2 = -7.5(t_max1)² + 1.5v₁t_max1

We also know that Andrew's ball lands after 4 seconds, which means that h(4) = 0:

h(4) = -5(4)² + v1 * 4 = 0

-80 + 4v1 = 0

v1 = 80/4

v1 = 20 m/s

Solving these equations for t_max2 and v2, we get:

t_max1 = v1 / (2 x 5)

t_max1 = 20 / (2 x 5)  = 2 s

t_max2 = 1.5t_max1 = 3 s

v2 = 1.5v1 = 30 m/s

To find the time it takes for Ben's ball to land, we need to find the time t2 when h(t2) = 0.

We can use the equation for h(t) with v = v2, h0 = 0, and solve for t:

-5t² + v₂t = 0

-5t² + 30 = 0

5t² = 30

t² = 30/5

t² = 6

t = √6

t = 2.5 s

Therefore, Ben's ball lands approximately 2.5 seconds after Andrew's ball.

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The function which represent the distance and time is y=6x-17.5.

A mathematical phrase, rule, or law that establishes the link between an independent variable and a dependent variable (the dependent variable). In mathematics, functions exist everywhere, and they are crucial for constructing physical links in the sciences.

Here according to the given data, let us take to points to find linear function then,

[tex](x_1,y_1)=(0.5,3)[/tex] and [tex](x_2,y_2)=(1,6)[/tex].

Now using slope formula, m = [tex]\frac{y_2-y_1}{x_2-x_1}[/tex]

=> Slope m = [tex]\frac{6-3}{1-0.5} = \frac{3}{0.5}[/tex] = 6

Now using equation formula , [tex]y-y_1=m(x-x_1)[/tex] then,

=> y-0.5=6(x-3)

=> y-0.5=6x-18

=> y=6x-18+0.5

=> y=6x-17.5

Hence the function which represent the distance and time is y=6x-17.5.

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a) The cost function can be represented as C(x) = 6 + 1.180x for the first 20 units and C(x) = 6 + 1.180(20) + 0.806(x-20) for units over 20.

b) The total charge for using 15 units is C(15) = 6 + 1.180(15) = $23.70.

c) If the total charge is $73.93, we can use the cost function to solve for the number of units used.

The graph of the cost function will have a linear portion for the first 20 units and then another linear portion with a different slope for units over 20.

The average charge is $23.70/15 = $1.58 per unit.

Since the total charge is greater than the cost for the first 20 units, we know that more than 20 units were used. We can use the second part of the cost function to solve for x:

73.93 = 6 + 1.180(20) + 0.806(x-20)
73.93 = 30.6 + 0.806x - 16.12
73.93 - 30.6 + 16.12 = 0.806x
59.44 = 0.806x
x = 73.69 units
Therefore, 73.69 units were used.

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The values of the other trigonometric functions are:

sinα =√6/3

tanα=√2

cosecα=3/√6

secα=√3

cotα=1/√2

Given that cosα=√3/3

By definition cosine function , it is a ratio of adjacent side and hypotenuse.

So, adjacent side  =√3

Hypotenuse = 3

Let us find the third side of a triangle, by using pythagoras theorem.

√3²+x²=3²

3+x²=9

x=√6

So opposite side is √6.

Now let us find the other trigonometric values

Sinα= opposite side/hypotenuse

Sinα=√6/3

Tanα=opposite side/adjacent side

=√6/√3

Tanα=√2

Cosecα = hypotenuse/opposite side

=3/√6

Cosecα=3/√6

secα=hypotenuse side/adjacent side

=3/√3

=√3

secα=√3

cotα=Adjacent side/opposite side

=√3/√6

cotα=1/√2

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The compete question is given in attachment.

The three cοrrect statements fοr the given circle are:

1)The radius οf the circle is 3 units.

2)The centre οf the circle lies οn the x-axis.

3)The radius οf this circle is the same as the radius οf the circle whοse equatiοn is x² + y² = 9.

All pοints in a plane that are at a specific distance frοm a specific pοint, the centre, fοrm a circle. In οther wοrds, it is the curve that a mοving pοint in a plane draws tο keep its distance frοm a specific pοint cοnstant. Circle's basic equatiοn is represented by:

(x-h)² + (y-k)² = r²

where the radius is r and the circle's centre's cοοrdinates are (h,k). Hence, we can quickly determine the equatiοn οf a circle if we knοw its radius and centre cοοrdinates.

The equatiοn οf the circle is given as:

x² + y²– 2x – 8 = 0

This can be cοnverted tο the standard fοrm.

Fοr that, we add and subtract 1 in the abοve equatiοn.

x² + y²– 2x – 8 +1 - 1  = 0

Rearranging,

x² – 2x + 1 + y²– 8 -1 = 0

(x - 1)² + y² = 8+1 = 9

Sο the equatiοn οf the circle in the standard fοrm is:

(x - 1)² + y² = 9

Nοw we will lοοk intο the given statements.

1) The radius οf the circle is 3 units.

This is true because radius = √9 = 3 units.

2) The centre οf the circle lies οn the x-axis.

The centre οf the given circle is (1,0).

Sο it dοes lie οn the x-axis.

3) The centre οf the circle lies οn the y-axis.

The centre is (1,0).

Sο this is nοt true.

4)The standard fοrm οf the equatiοn is (x – 1)² + y² = 3.

This is false.

5)  The radius οf this circle is the same as the radius οf the circle whοse equatiοn is x² + y² = 9

This is true because bοth equatiοns have 9 οn the right side οf the equatiοn.

Therefοre the three cοrrect statements fοr the given circle are:

1)The radius οf the circle is 3 units.

2)The centre οf the circle lies οn the x-axis.

3)The radius οf this circle is the same as the radius οf the circle whοse equatiοn is x² + y² = 9.

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The lakefront makes angles of approximately 30 degrees and 120 degrees with the boundaries of 2.8 miles and 1.8 miles, respectively. The remaining angle is approximately 30 degrees.

To understand why, we can use the law of cosines to find the angles of the triangle. Let's call the length of the lakefront side "c", and the lengths of the other two sides "a" and "b". Using the law of cosines, we can find the angles:

[tex]cos A = (b^2 + c^2 - a^2) / (2bc)[/tex]

[tex]cos B = (a^2 + c^2 - b^2) / (2ac)[/tex]

[tex]cos C = (a^2 + b^2 - c^2) / (2ab)[/tex]

Plugging in the values we know, we get:

[tex]cos A = (1.8^2 + 4^2 - 2.8^2) / (21.84) = 0.283[/tex]

[tex]cos B = (2.8^2 + 4^2 - 1.8^2) / (22.84) = 0.717[/tex]

[tex]cos C = (2.8^2 + 1.8^2 - 4^2) / (22.81.8) = -0.283[/tex]

Using the inverse cosine function, we can find the angles:

A ≈ 75 degrees

B ≈ 43 degrees

C ≈ 62 degrees

Therefore, the lakefront makes angles of approximately 30 degrees (180 - 75 - 75) and 120 degrees (180 - 43 - 17) with the other two boundaries, and the remaining angle is approximately 30 degrees (180 - 120 - 30).

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Number of years = 4

Hi there! To answer your question, Doug needs to deposit $2226.19 into a savings account that earns 2.9% interest compounded continuously. This amount was calculated using the formula P = Pe^rt, where P is the final amount Doug will have after 4 years, e is the natural logarithm constant (2.71828), r is the interest rate (2.9%), and t is the number of years (4).

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Answer:

Step-by-step explanation:

It seems like the problem is asking about a sequence of shapes rather than a sequence of matches, so I will assume that the correct information for the problem is:

Number of shapes:

n=1 n=2 n=3

m-4 m=7 m+2

i) Sequence table for the first six patterns:

Pattern number Number of shapes

1                               m-4

2                               m

3                               m+2

4                               m+6

5                               m+10

6                               m+14

ii) Formula for the number of shapes in terms of the pattern number:

From the table, we can see that the number of shapes used in each pattern is increasing by a constant amount of 4. Therefore, we can write the formula as:

Number of shapes = (pattern number - 1) * 4 + m

where m is the number of shapes in the first pattern.

iii) Number of shapes used in the 300th pattern:

To find the number of shapes used in the 300th pattern, we can use the formula and substitute pattern number = 300:

Number of shapes = (300 - 1) * 4 + m

Since we don't know the value of m, we can't determine the exact number of shapes. However, we do know that the number of shapes in the first pattern is either m-4, m, or m+2, depending on the value of m. If we assume the smallest possible value of m, which is 1 (since the number of shapes can't be negative), then the number of shapes in the 300th pattern would be:

Number of shapes = (300 - 1) * 4 + 1-4 = 1195

Therefore, if m = 1, then the number of shapes used in the 300th pattern is 1195. However, if m is greater than 1, then the number of shapes in the 300th pattern would be higher.

Answer:

every other 3

Step-by-step explanation:

The required fill-in-the-blanks are "same" and "line segments".

A linear relationship is a connection that takes the shape of a straight line on a graph between two distinct variables - x and y. When displaying a linear connection using an equation, the value of y is derived from the value of x, indicating their relationship.

Sometimes, the relationship between the variables doesn't stay the "same". This type of relation is called a piecewise linear relationship.

The graph of a piecewise linear relationship is made of non-overlapping "line segments", like this one.

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(a) The probability that X = n is 2^n-1 / 2^N - 1.

(b) ɸ(t) = E[2^tx] = ∑_{n=1}^N 2^tx P(X=n) = ∑_{n=1}^N 2^tx (2^n-1 / 2^N - 1) = (2^t / 2^N - 1) ∑_{n=1}^N 2^(n-1)t = (2^t / 2^N - 1) (2^Nt - 1) / (2^t - 1) = 2^Nt / (2^N - 1)

(c) The probability that X = n and Y = m is 2^(n-m-1) / 2^N - 1.

(d) This is the same as finding the probability that the difference between the maximum and minimum elements of a subset of {1,...,N} is k. If k = 0, then the only subsets with maximum and minimum elements differing by k are the single-element subsets, so P(W=k) = N / 2^N - 1. If k > 0, then there are (N-k) choices for the minimum element m and 2^(k-1) subsets of {m+1,...,m+k-1}, so P(W=k) = (N-k) 2^(k-1) / 2^N - 1.

To find the probability mass function of X, we need to find the probability that X = n for each n ∈ {1,...,N}. This is the same as finding the probability that the maximum element of a subset of {1,...,N} is n. There are 2^n-1 subsets of {1,...,n-1}, and each of these subsets can be combined with n to form a subset of {1,...,N} with maximum element n. Therefore, the probability that X = n is 2^n-1 / 2^N - 1.

To find the value of ɸ(t) for any t ∈ R, we need to compute the expected value of 2^tx. Using the formula for expected value, we get:

ɸ(t) = E[2^tx] = ∑_{n=1}^N 2^tx P(X=n) = ∑_{n=1}^N 2^tx (2^n-1 / 2^N - 1) = (2^t / 2^N - 1) ∑_{n=1}^N 2^(n-1)t = (2^t / 2^N - 1) (2^Nt - 1) / (2^t - 1) = 2^Nt / (2^N - 1)

To find the joint probability mass function of (X,Y), we need to find the probability that X = n and Y = m for each n,m ∈ {1,...,N}. If n = m, then the only subset of {1,...,N} with maximum element n and minimum element m is {n}, so P(X=n, Y=m) = 1 / 2^N - 1. If n ≠ m, then there are 2^(n-m-1) subsets of {m+1,...,n-1}, and each of these subsets can be combined with m and n to form a subset of {1,...,N} with maximum element n and minimum element m. Therefore, the probability that X = n and Y = m is 2^(n-m-1) / 2^N - 1.

To find the probability mass function of W = X - Y, we need to find the probability that W = k for each k ∈ {0,...,N-1}. This is the same as finding the probability that the difference between the maximum and minimum elements of a subset of {1,...,N} is k. If k = 0, then the only subsets with maximum and minimum elements differing by k are the single-element subsets, so P(W=k) = N / 2^N - 1. If k > 0, then there are (N-k) choices for the minimum element m and 2^(k-1) subsets of {m+1,...,m+k-1}, so P(W=k) = (N-k) 2^(k-1) / 2^N - 1.

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Step-by-step explanation:

cost1(t) = 100.25t + 6500

cost2(t) = 225.5t + 4496

both companies charge the same for the amount of t (tons), when both functions deliver the same result :

100.25t + 6500 = 225.5t + 4496

2004 = 125.25t

t = 2004/125.25 = 16

1. for the transport of 16 tons of sugar they both charge the same.

2. that charge is

100.25×16 + 6500 = $8,104

Answer: y = 1/3x + 2

Step-by-step explanation:

y =  mx+b

to find m: m = 3 - 5 / -3 - (- 9)  = -2 / 6 = - 1 / 3

to find b:

3 = -1 / 3 (-3) + b

3 = 1 + b

b = 2

Answer:

Step-by-step explanation:

This expression isn't in simplest form. The terms 3x and 2x can be added, since they are like terms.

In simplest form, this expression would be 5x - 4.

Hope this helps!

The figure's perimeter, rοunded tο the nearest hundredth, is rοughly 51.39 feet.

The tοtal length οf a twο-dimensiοnal shape's bοundary οr οuter edge is knοwn as its perimeter. It is the space encircling the periphery οf a shape. Yοu add up the lengths οf all a shape's sides tο determine its perimeter. The length units used tο measure the sides have an impact οn the perimeter measurement units.

given:

The lengths οf all the edges must be added up in οrder tο determine the figure's perimeter.

The figure is made up οf a rectangle with a length οf 3 feet and a breadth οf 9 feet, twο semicircles with a diameter οf 9 feet each, and twο semicircles.

A semicircle with a diameter οf 9 feet has the fοllοwing circumference:

C = 1/2 * pi * d

C = 1/2 * 3.14 * 9

C = 14.13 feet

The circumference οf bοth semicircles taken tοgether is thus:

P = 2*14.13P = 28.26 feet

The rectangle's perimeter is as fοllοws:

P(rectangle) is equal tο 2 * (length + width).

P(rectangle) = 3 + 9 * 2

24 feet P(rectangle)

As a result, the figure's οverall perimeter is as fοllοws:

Semicircles: P = P + P (rectangle)

P = 28.26 + 24

P = 52.26 feet

The figure's perimeter, rοunded tο the nearest hundredth, is rοughly 51.39 feet.

Anοther figure with the same perimeter as the οne given can be drawn in a variety οf ways.

The figure's perimeter, rοunded tο the nearest hundredth, is rοughly 51.39 feet.

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The mixed integer would be 2 3/4.

A mixed integer is a number that includes both a whole number and a fraction. For example, 2 1/2 is a mixed integer because it includes the whole number 2 and the fraction 1/2.

To rewrite a fraction as a mixed integer, you need to divide the numerator (the top number) by the denominator (the bottom number) and find the quotient and remainder. The quotient will be the whole number part of the mixed integer and the remainder will be the numerator of the fraction part. The denominator will stay the same.

For example, if you have the fraction 11/4, you can divide 11 by 4 to get a quotient of 2 and a remainder of 3. So the mixed integer would be 2 3/4.

Here are the steps to rewrite a fraction as a mixed integer:
1. Divide the numerator by the denominator.
2. Write the quotient as the whole number part of the mixed integer.
3. Write the remainder as the numerator of the fraction part of the mixed integer.
4. Keep the denominator the same.
5. Simplify the fraction if necessary.

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The midpoint of the line segment whose endpoints are the given points is (8.1 , -21.7).

To find the exact distance between the points (9.6,-19.7) and (6.6,-23.7), we can use the distance formula:

distance = sqrt((x2 - x1)^2 + (y2 - y1)^2)

Substituting the given values:

distance = sqrt((6.6 - 9.6)^2 + (-23.7 - (-19.7))^2)

Simplifying:

distance = sqrt((-3)^2 + (-4)^2)

distance = sqrt(9 + 16)

distance = sqrt(25)

distance = 5

Therefore, the exact distance between the points is 5.

To find the midpoint of the line segment whose endpoints are the given points, we can use the midpoint formula:

midpoint = ((x1 + x2)/2 , (y1 + y2)/2)

Substituting the given values:

midpoint = ((9.6 + 6.6)/2 , (-19.7 + (-23.7))/2)

Simplifying:

midpoint = (16.2/2 , -43.4/2)

midpoint = (8.1 , -21.7)

Therefore, the midpoint of the line segment whose endpoints are the given points is (8.1 , -21.7).

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For a metal ball which is 3.25m long and weighs 15kg. Mass per meter of the metal bar would be 4.61 kg/m.

Accordingly, the metal bar's mass is 15 kg, Metal bar measures 3.25 meters in length. We're looking for the metal bar's mass per square meter.

Find the sum or total value of two or more numbers by adding them together. It is possible to calculate their difference by subtracting one number from the other. Times or repeated addition are examples of multiplication. After multiplying two or more numbers, the result is a product. Splitting an amount into equal parts is the process of division. When compared to multiplication, it is exactly the opposite.

Afterwards, we can calculate,

The mass per meter of the metal bar = mass of the metal bar / length of the metal bar

⇒ 15 kg / 3.25 m

[tex]= \frac{15}{3.25}=4.61kg/m[/tex]

Hence, the mass per meter of the metal bar would be 4.61 kg/m.

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Answer:

144

Step-by-step explanation:

6*6=36

36*4=144

1. False. The probabilities of two mutually exclusive events should add up to 1. In this case, the probability of it raining and not raining should add up to 1, but .4 + .52 = .92, which is not equal to 1.

2. False. The probabilities of all possible outcomes should add up to 1. In this case, the probabilities of the printer making 0, 1, 2, 3, or 4 or more mistakes should add up to 1, but .19 + .34 + -.25 + .43 + .29 = .97, which is not equal to 1. Additionally, the probability of an event cannot be negative, so -.25 is not a valid probability.

3. True. The probabilities of all possible outcomes add up to 1 (.19 + .38 + .29 + .15 = 1) and none of the probabilities are negative.

4. True. The probabilities of the three events add up to 1 (1/4 + 1/2 + 1/8 = 7/8) and none of the probabilities are negative.

5. The probability of getting a head on a fair coin toss is 1/2. The probability of getting either a head or a tail is 1, since those are the only two possible outcomes. The probability of getting neither a head nor a tail is 0, since there are no other possible outcomes.

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ANOVA results

1. This study is a between-subjects design.
2. The independent variable is the type of medication given and the dependent variable is the participants' blood pressure levels.

The effect size (hp2) for the ANOVA results is a measure of the strength of the relationship between the independent variable (type of medication) and the dependent variable (blood pressure levels).

A larger effect size indicates a stronger relationship between the two variables. It is important to remember that SPSS reports a partial-eta squared, which has a slightly different interpretation than Cohen's d or correlations.

Partial-eta squared is the proportion of the total variance in the dependent variable that is explained by the independent variable, after controlling for other factors. A partial-eta squared of .01 is considered a small effect, .06 is considered a medium effect, and .14 is considered a large effect.

Hence,

1. This study is a between-subjects design because each participant is only assigned to one group and is only exposed to one level of the independent variable.
2. The independent variable is the type of medication given (high dose HyBlox, low dose HyBlox, or placebo) and the dependent variable is the participants' blood pressure levels.

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Check the picture below.

[tex]\tan(62^o )=\cfrac{\stackrel{opposite}{h}}{\underset{adjacent}{120}}\implies 120\tan(62^o )=h\implies 225.69\approx h[/tex]

Make sure your calculator is in Degree mode.

The height of the tower is 226 feet.

One area of mathematics known as trigonometry examines the relationship between the sides and angles of a right triangle. The relationship between sides and angles is defined for 6 trigonometric functions.

We have,

A tower with height labeled h.

The tower is the height of a right triangle with base of length 120 feet.

Now using Trigonometry

tan 62 = P / B

tan 62 = h / 120

h = 120 tan 62

h = 225.69

h = 226 feet

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To show that Col A is the subspace spanned by the columns of A, we need to show that:

Col A is a subspace of RN.

Col A is spanned by the columns of A.

To show that Col A is a subspace of RN, we need to show that it satisfies the three subspace properties:

a. Col A contains the zero vector. This is true since the equation Ax = 0 always has a solution x = 0, which means that the zero vector is in Col A.

b. Col A is closed under addition. Suppose b1 and b2 are in Col A, so there exist x1 and x2 such that Ax1 = b1 and Ax2 = b2. Then, for any scalars c1 and c2, we have:

A(c1x1 + c2x2) = c1Ax1 + c2Ax2 = c1b1 + c2b2

which shows that c1b1 + c2b2 is also in Col A.

c. Col A is closed under scalar multiplication. Suppose b is in Col A, so there exists x such that Ax = b. Then, for any scalar c, we have:

A(cx) = c(Ax) = cb

which shows that cb is also in Col A.

Therefore, Col A is a subspace of RN.

To show that Col A is spanned by the columns of A, we need to show that any vector b in Col A can be expressed as a linear combination of the columns of A. By definition, there exists an x such that Ax = b.

This means that b is a linear combination of the columns of A, with the coefficients given by the entries of x. Specifically, if A has columns a1, a2, ..., an, then:

b = Ax = x1a1 + x2a2 + ... + xn an

Therefore, Col A is spanned by the columns of A.

Overall, we have shown that Col A is the subspace spanned by the columns of A.

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