Answer:
21 in = n
Explanation:
divide the perimeter by two and you will find the value of n + 15 2/4 (base + height), then find n with an equation
73 : 2 = 36.5
36.5 = n + 15 2/4
36.5 - 15 = n + 2/4
36.5 - 15 - 2/4 = n
21 = n
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check
2 × (21 + 15 2/4) =
2 × 36.5 =
73