Question 53 Answer and Explanation _ACT June 2015 Form 73C Math Section

53. The height above the ground, h units, of an object t seconds after being thrown from the top of a building is given by the equation $h\,=\,-2{t}^{2}\,+\,10t\,+\,48$ . An equivalent factored form of this equation shows that the object:

A. starts at a point 2 units off the ground.

B. reaches a maximum height of 3 units

C. reaches a maximum height of 8 units.

D. reaches the ground at 3 seconds.

E. reaches the ground at 8 seconds.

Answer and Explanation

Your Answer is

Correct Answer is E

Explanation

It can be seen from the function analysis formula that when h=0, t=8, it means that it is the 8th second when it lands, and E is correct.