Solve the problem.
-If a rock falls from a height of 80 meters on Earth, the height H (in meters) after x seconds is approximately $$H ( x ) = 80 - 4.9 x ^ { 2 }$$ What is the height of the rock when x = 1.5 seconds? Round to the nearest hundredth, if necessary.
A) 72.65 m
B) 68.98 m
C) 91.03 m
D) 69.2 m

Question

Quizplus · Accepted Answer

Substitute x = 1.5 into the equation: H(1.5) = 80 - 4.9(1.5)^2 = 80 - 4.9(2.25) = 80 - 11.025 = 68.975, which rounds to 68.98 m.

Solve the Problem H(x)=80−4.9x2H ( x ) = 80 - 4.9 x ^ { 2 }H(x)=80−4.9x2

Solve the Problem $H ( x ) = 80 - 4.9 x ^ { 2 }$