Answer :

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]

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