Question

It keeps saying my answer is wrong

Answer 1

Since the formula is $\frac{1}{2}h(B1+B2)$, here's the answer.

First we do $\frac{1}{2}10$, 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: