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3 years ago

7

A rectangular painting is 42 centimeters wide and 51 centimeters long. What is the perimeter of this painting?

1 answer:

Alex3 years ago

6 0

186cm
You add all the sides up, so 42+42+51+51 which equals 186cm

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Can someone help plz :')

olga_2 [115]

Answer:

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Step-by-step explanation:

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3 years ago

Use a composite figure to estimate the area of the figure.

bezimeni [28]

A) about 14 square units

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3 years ago

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If you can get 4 bottles of fruit juice for 10 dollars how much would 1 bottle cost

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2 years ago

Simplify 3a-3b/3a+12b

Lena [83]

If it is a fraction like (3a-3b)/(3a+12b)
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3 years ago

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Let f(x) = 1/x . Find the number b such that the average rate of change of f on the interval [2, b] is − 1/8

vekshin1

Answer:

b=4

Step-by-step explanation:

So, we have the function $f(x)=1/x$ . We need to find b such that the average rate of change or the slope is -1/8 between the intervel [2, b]. First, let's find f(2).

f(2) = 1/(2) = 1/2

So, we have the point (2, 1/2)

At point b, f(b) = 1/b.

Let's plug this into the slope formula:

$\frac{y_2-y_1}{x_2-x_1}=\frac{.5-\frac{1}{b} }{2-b} =-1/8$

Now, we just need to solve for b. First, let's multiply both the numerator and denominator by b (to get rid of the annoying fraction in the numerator).

$\frac{.5b-1}{2b-b^2} =\frac{-1}{8}$

Now, cross multiply.

$4b-8=b^2-2b$

$b^2-6b+8=0$

Solve for b. Factor using the numbers -4 and -2.

$=(b-4)(b-2)=0$

Thus, b=4 or b=2.

However, b=2 is not a possible solution since the interval [2,2] means nothing. Thus, b=4.

4 0

3 years ago