Answer
c) downward with the vertex at $(.1, 3.6)$
Work Step by Step
$f(x) = -213(x-.1)^2+3.6$
The graph opens downward due to the negative sign being the coefficient on the $213$. Also, the function has its vertex at $x=.1$.
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 11 - Section 11.5 - Quadratic Functions and Their Graphs - Exercise Set - Page 812: 57
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