Question

A ball is thrown from an initial height of 7 feet with an initial upward velocity of 17ft/s . The ball's height h (in feet) after seconds t is given by the following.
h=7+17t-16t^2

Find all values of t for which the ball's height is 11 feet.
Round your answer(s) to the nearest hundredth.
(If there is more than one answer, use the "or" button.)

Answer 1

this is the formula:
11=-16t^2 + 17t + 7
now, solve it like a quadratic. first, set it equal to 0
0 = -16t^2 +17t -4
now, with the quadratic formula, we get:
t = 0.35 or t = 0.71

Answer 2

Okay thanksss;)

Answer 3

you're welcome :)