Margie is standing on a bridge looking at the river below. She throws a rock over the bridge with an initial
velocity of 60 ft/sec. If the height, h, of the rock at the rime t seconds after it was thrown can be modeled by the
equation h(t) = −16t

2 + 60t + 72, how long will it take for the rock to reach the surface of the water? Round

to the nearest tenth.

Here we know that Margie is standing on a bridge looking at the river. She throws a rock over the bridge with an initial  velocity of 60 ft/sec. The height, h, of the rock at the rime t seconds after it was thrown can be modeled by the  equation:

To calculate how long will it take for the rock to reach the surface of the water, we need to set . So:

Given that time can't be negative, we just choose the positive value. Therefore, it will take 4.70 seconds for the rock to reach the surface water.

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2/3

step-by-step explanation:

the slope of a line is equal to the rise/run. in this case the line rises 2 units for every +3 units it moves