Answer
2.25 inches
Work Step by Step
We will use the point $(6,4)$ to plug in the equation: $y=ax^2\\4=a(6)^2\\a=\frac{1}{9}$
Find the focus: $c=\frac{1}{4a}=\frac{1}{4(1/9)}=\frac{9}{4}=2.25$ inches
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 9 Quadratic Relations and Conic Sections - Mixed Review of Problem Solving - Lessons 9.1-9.4 - Page 641: 9
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