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 16: 63


See below.

Work Step by Step

The number of rainbow fish bought is: $25-x-y$. Then the amount spent is: $f(x,y)=x\cdot1.5+y\cdot2+(25-x-y)\cdot8=1.5x+2x+200-8x-8y=200-6.5x-6y$. Thus if we buy 8 danios, 10 tetras, and rainbow fish, the cost is: $f(8,10)=200-6.5\cdot8-6\cdot10=200-52-60=88$
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