30 in = 2.5 ft
A = (1/2)(2.5 ft)(3 ft) = 3.75 ft²
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Step-by-step explanation:.
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The equation doesn't doesn't represent a proportional relationship because proportional relationships always end with x. Also when you add anything behind the unit rate, it is not proportional.
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are you sure its b? b doesnt seem to be present in 2x-y=6