please help with the steps. The first page is find the area and the second page is find the perimeter.

Evaluate the expression for the given value of the variable 7a - 4a for a =8

When you find the area of a triangle do you use in. or in2

What will be the end result for the taxpayer who filed his federal income tax return using the 1040ez form shown belowa he'll owe $173b he'll receive a refund of $173c he'll owe $3921d he'll receive a refund of $3921