Michelle's result shows f(2) = -13, selection C.
3.1
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Divide 18000 by 24= get a calculater
(2/5) / 1 = x / (3/4).....2/5 cups to 1 pie = x cups to 3/4 pie
cross multiply
(1)(x) = (2/5)(3/4)
x = 6/20 which reduces to 3/10 cups <==