Answer
quadratic, negative.
Work Step by Step
Based on the given data, a quadratic model should be appropriate. As the parabola opens downward, the leading coefficient of $x^2$ should be negative.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 3 - Polynomial and Rational Functions - 3.1 Quadratic Functions and Models - 3.1 Execises - Page 315: 55
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