Question

What do you do?/how do you do it?

Answer 1

a. all positive numbers are real numbers

Answer 2

C

Explanation:

given

h(t) = - 16t² + 40t

To find the zeros equate h(t) to zero, that is

- 16t² + 40t = 0 ← factor out - 4t from each term

- 4t(4t - 10) = 0

Equate each factor to zero and solve for t

- 4t = 0 ⇒ t = 0

4t - 10 = 0 ⇒ 4t = 10 ⇒ t =
`(10)/(4)` = 2.5

The domain of h(t) is all real numbers between 0 and 2.5