12. Elmo is standing on a parade float tossing candy out to everyone. The candy is thrown with a starting velocity of 10 feet per second from a height of 3 feet modeled by the equation: h= -16t2 + 10t + 3

After how many seconds will the ball be 2 feet in the air?

a. 0.125

b. 0.5

c. 0.71

d. 0.625

c. 0.71

Step-by-step explanation:

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

.

This polynomial has roots such that , given by the following formulas:

The height of the candy after t seconds is given by the following equation:

After how many seconds will the ball be 2 feet in the air?

This is t for which

So

So

Since time is a positive measure, the answer is 0.71, which is option c.

step-by-step explanation:

options