Question

Please help and thank you

Answer 1

`b_(1)=(2A)/(h)-b_(2)`

Explanation:

Given:
`A=(1)/(2)(b_(1) +b_(2))h`

We need to completely isolate
`b_(1)` to solve.

`A=(1)/(2)(b_(1) +b_(2))h`

`A=((1)/(2)b_(1) +(1)/(2) b_(2))h`

`A=(1)/(2)b_(1) h+(1)/(2)b_(2)h`

`-(1)/(2)b_(1)h+A=(1)/(2)b_(2)h`

`-(1)/(2)b_(1)h=-A+(1)/(2)b_(2)h`

`-(1)/(2)b_(1)=(-A)/(h)+(1)/(2)b_(2)`

Finally, multiply both sides by -2 to completely isolate
`b_(1)`.

`b_(1)=(2A)/(h)-b_(2)`

Answer 2

The right option is D

Explanation:

See the image