A shark jumps out of the water. The quadratic function f (x) = - 16x^2 + 18x models the sharks height in feet above the water after x seconds. How long is the shark out of water

Question

Mathematics

Josiah Hebert

21 May, 19:39

A shark jumps out of the water. The quadratic function f (x) = - 16x^2 + 18x models the sharks height in feet above the water after x seconds. How long is the shark out of water

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Answers (1)

Know the Answer?

Bridger Bryant · Answer 1

When at height>0, that is when it is below the water

find zeroes

0=-16x^2+18x

0=x (-16x+18)

solve

0=x

0=-16x+18

16x=18

x=18/16

x=9/8

from x=0 to x=9/8

9/8 seconds or1.125 seconds