3. A = 1/2bh
Solve for b

2( A/h ) = b

Step-by-step explanation:

A = 1/2 ( b ) ( h )       Write out the equation. Divide h on both sides

A/h = 1/2 ( b )           Multiply 2 on both sides

2( A/h ) = b               Final Equation

Example:             50 = 1/2 ( b ) ( 10 )

                       50/10 = 1/2 ( b )        

                 2( 50/10 ) = b    

                        2( 5 ) = b

                             10 = b

answer: the area of the parallelogram below is 42 square meters.

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