Question

I don't know how to do this :(((. help?​

Answer 1

B. 13.5 in^2

Explanation:

Use the formula
`(a+b)/(2) h`.

Step 1- Substitute into the formula.

`(a+b)/(2) h` =
`(4+5)/(2) 3`

Step 2- Add to simplify

`(4+5)/(2) 3` =
`(9)/(2)3`

Step 3- Divide

9/2= 4.5

Step 4- Multiply

4.5× 3= 13.5

B. 13.5 in^2