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[Jcc]

Recently tried to solve this problem below:

A person throws a ball into the air. The height (in feet) f(t) of the ball after t seconds is given by f(t)=-16t²+64t+4.

a. When is the ball at a height of 4 feet? Explain why there are two such times.

 

[wjm11]

Recently tried to solve this problem below:

A person throws a ball into the air. The height (in feet) f(t) of the ball after t seconds is given by f(t)=-16t²+64t+4.

a. When is the ball at a height of 4 feet? Explain why there are two such times.

What did you try? Where is your work?

You have the function, which describes the height of the ball. Just plug in 4 for f(t) and solve the quadratic.