Question

Please explain how to solve & the answer!

Answer 1

B

Explanation:

given

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

multiply both sides by 2 to eliminate the fraction

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

divide both sides by the multiplier h

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

Subtract
`b_(2)` from both sides

`(2A)/(h)` -
`b_(2)` =
`b_(1)`, that is

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