91Ó°ÊÓ

In the following exercises, solve. Round approximations to one decimal place.

Landscaping Vince wants to

make a square patio in his yard.

He has enough concrete to pave

an area of 130 square feet. Use the

formula $s=\sqrt{A}$to find the length

of each side of his patio. Round

your answer to the nearest tenth of a foot.

Gravity : While putting up holiday decorations, Renee dropped a light bulb from the top of a 64 foot tall tree. Use the formula $\mathit{t}\mathbf{=}\frac{\sqrt{\mathbf{h}}}{\mathbf{4}}$to find how many seconds it took for the light bulb to reach the ground.

Gravity : An airplane dropped a flare from a height of 1024 feet above a lake. Use the formula $\mathit{t}\mathbf{=}\frac{\sqrt{\mathbf{h}}}{\mathbf{4}}$to find how many seconds it took for the flare to reach the water.

Gravity: A hang glider dropped his cell phone from a height of 350 feet. Use the formula$\mathit{t}\mathbf{=}\frac{\sqrt{\mathbf{h}}}{\mathbf{4}}$ to find how many seconds it took for the cell phone to reach the ground.

Gravity: A construction worker dropped a hammer while building the Grand Canyon skywalk, 4000 feet above the Colorado River. Use the formula $\mathit{t}\mathbf{=}\frac{\sqrt{\mathbf{h}}}{\mathbf{4}}$to find how many seconds it took for the hammer to reach the river.

Accident investigation: The skid marks for a car involved in an accident measured 54 feet. Use the formula $\mathit{s}\mathbf{=}\sqrt{\mathbf{24}\mathbf{d}}$to find the speed of the car before the brakes were applied. Round your answer to the nearest tenth.

Accident investigation: The skid marks for a car involved in an accident measured 216 feet. Use the formula $\mathit{s}\mathbf{=}\sqrt{\mathbf{24}\mathbf{d}}$to find the speed of the car before the brakes were applied. Round your answer to the nearest tenth.

Accident investigation: An accident investigator measured the skid marks of one of the vehicles involved in an accident. The length of the skid marks was 175 feet. Use the formula $\mathit{s}\mathbf{=}\sqrt{\mathbf{24}\mathbf{d}}$to find the speed of the vehicle before the brakes were applied. Round your answer to the nearest tenth.

Accident investigation: An accident investigator measured the skid marks of one of the vehicles involved in an accident. The length of the skid marks was 117 feet. Use the formula$\mathit{s}\mathbf{=}\sqrt{\mathbf{24}\mathbf{d}}$ to find the speed of the vehicle before the brakes were applied. Round your answer to the nearest tenth.

In the following exercises, simplify.

$\sqrt{196a^2{b}^2}$