Question

It keeps saying my answer is wrong

Answer 1

Since the formula is
`(1)/(2)h(B1+B2)`, here's the answer.

First we do
`(1)/(2)10`, which gives us 5.

Then we do
`5(20+8)`, which gives us
`5(28)`.

At last we do
`5*28`, and we get 140.

So, the answer would be 140.

Hope this helped! c: