Barry records the height of a balloon from the ground, from 2 seconds after he let it go for 12 seconds. The function h(t) = |t + 2| − 1 models the height h feet over t seconds after he let the balloon go. What was the balloon's height from the ground when Barry stopped recording the height?

A. 1 ft
B. 3 ft
C. 13 ft
D. 15 ft

The diameter of a ball is 8 in. what is the volume of the ball? use 3.14 for pi. enter your answer as a decimal in the box. round only your final answer to the nearest hundredth.

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters