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3 years ago

Which of the following is an x-intercept of the function, f(x) = x^2 - 64 ?

Mathematics

1 answer:

Luden [163]3 years ago

4 0

Answer:

D. -8

Step-by-step explanation:

An x intercept is where the y value is zero.

We set the expression equal to zero and solve for x.

x^2 - 64 = 0

(x + 8)(x - 8) = 0

x + 8 = 0 or x - 8 = 0

x = 8 or x = 8

Answer: D. -8

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3 years ago

You can paint 75 square feet of a surface every 45 minutes. Determine how long it takes you to paint a wall with the given dimen

marin [14]

Answer:

25.2 minutes

Step-by-step explanation:

step 1

Find the area of the given wall

$A=(7)(6)=42\ ft^2$

step 2

we know that

You can paint 75 square feet of a surface every 45 minutes

using proportion

Find out how long it takes you to paint a surface area of 42 square feet

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3 years ago