Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 1, Equations and Inequalities - 1.2 Evaluate and Simplify Algebraic Expressions - 1.2 Exercises - Problem Solving - Page 15: 62


See below.

Work Step by Step

Let $x$ be the number of desktop computers bought ($0\leq x\leq80$). Then the number of laptops bought is: $80-x$. Then the amount spent if we buy $x$ desktop computers is: $f(x)=x\cdot900+(80-x)\cdot1550=900x+124000-1550x=124000-650x$. Thus if $65$ choose desktops, the cost is: $f(65)=124000-650\cdot65=81750$
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