Answer:
18
Explanation:
Area = 342 sq yds.
b2 = 21
b1 = 17
h = ??
Area = (b1 + b2)*h/2
342 = (17 + 21)*h/2
342 = (38)*h/2
342 = 19 * h
342 / 19 = 19h / 19
h = 18
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