Round your answer to the nearest tenth, when appropriate.

-A toy rocket is shot vertically upward from the ground. Its distanœe in feet from the ground in $t$ seconds is given by $h(t)=-16 t^{2}+133 t$. At what time or times will the ball be 146 feet from the ground?
A) $8.3 \mathrm{sec}$
B) $129.1 \mathrm{sec}, 136.9 \mathrm{sec}$
C) $1.3 \mathrm{sec}, 7 \mathrm{sec}$
D) $4.2 \mathrm{sec}$

Question

Round your answer to the nearest tenth, when appropriate.

-A toy rocket is shot vertically upward from the ground. Its distanœe in feet from the ground in $t$ seconds is given by $h(t)=-16 t^{2}+133 t$. At what time or times will the ball be 146 feet from the ground?
A) $8.3 \mathrm{sec}$
B) $129.1 \mathrm{sec}, 136.9 \mathrm{sec}$
C) $1.3 \mathrm{sec}, 7 \mathrm{sec}$
D) $4.2 \mathrm{sec}$

Quizplus · Accepted Answer

To find when the rocket is 146 feet from the ground, solve the equation $-16t^2 + 133t = 146$. Rearranging gives $-16t^2 + 133t - 146 = 0$. Solving this quadratic equation using the quadratic formula yields $t \approx 1.3$ and $t \approx 7$.

Round Your Answer to the Nearest Tenth, When Appropriate ttt Seconds Is Given By

Round Your Answer to the Nearest Tenth, When Appropriate $t$ Seconds Is Given By