Write an algebraic expression to model the unknown number situation. the sum of five and a number Complete each statement to explain how to model this situation. Replace “a number” with n . Replace “sum” with . Replace “five” with . The correct algebraic expression is .

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

answer:

f(5/2) = 10/3

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