A person standing close to the edge on top of a 64 foot building throws a ball vertically upward. The quadratic function h=-16t^2 + 120t + 64 models the balls height above the ground, h, in feet, t seconds after it was thrown

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

about 168 miles

step-by-step explanation:

answer is c

step-by-step explanation:

81/12=324/x

x=48