(need help with checking answers)

Question

The height , h, in feet, of a bottle rocket is modeled by: h = -16t^2 + 60t

where t is the time in seconds.

A. Factor the expression.

H = 16t^2 +60 = 4(4t^2 + 15)

B. What is the height of the rocket after 2 seconds?

H = 4(4 times 2^2 + 15) = 4(16 + 15) = 128 ft

C. What is the height of the rocket after 3.75 seconds? Explain the solution.

4(4 times 3.75^2 + 15)

H(3.75) = 285

Answer 1

h = -16t^2 + 60t = 4t(-4t+15)

now work on B and C again.