Answer:
= 30mn^4
Explanation:
The area of a trapezoid
A = 1/2 (a+b) *h
where a and b are the top and bottom
A = 1/2( 3mn^2+ 9mn^2) * 5n^2
Combine like terms
A = 1/2(12mn^2) * 5n^2
=6mn^2 * 5n^2
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