A store offers packing and mailing services to customers. The cost of shipping a box is a combination of a flat packing fee of 5 dollars and an amount based on the weight in pounds of the box, 2 point 2 5 dollars per pound. Which equation represents the shipping cost as a function of x , the weight in pounds?
Answer
A
f of x is equal to 2 point 2 5 x minus 5
B
f of x is equal to 5 x plus 2 point 2 5
C
f of x is equal to 5 x minus 2 point 2 5
D
f of x is equal to 2 point 2 5 x plus 5
Explanation
The shipping cost includes a flat fee of $5 plus $2.25 for each pound. For a box weighing x pounds, the weight-based charge is 2.25x, so the total cost is f(x) = 2.25x + 5. Choice B gives this equation.
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