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Answer:
5
Step-by-step explanation:
the area of a parallelogram is represented in this formula:
[tex]A=bh[/tex]
we can rearrange this to solve for [tex]b[/tex]
[tex]\frac{A}{h} =b[/tex]
[tex]\frac{20}{4} =5[/tex]
Therefore [tex]b=5[/tex]