What is the area of a rectangle whose side's are (3m+1) and (3m+7) meters long ?
A.(9m²+11m+7) square units
B.(9m²+24m+7)square units
C.(6m²+24m+7)square units
D.(6m²+11m+7)square units
A.(9m²+11m+7) square units
B.(9m²+24m+7)square units
C.(6m²+24m+7)square units
D.(6m²+11m+7)square units
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A = (3m + 1)(3m + 7)
= 9m² + 21m + 3m + 7
A = (9m² + 24m + 7) units²
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