Suppose a toy rocket is launched vertically upward from ground level with an initial velocity of 128 feet per second. if air resistance is ignored, the rocket's h height after t seconds is given by the equation h = −16t2 +128t. How long will the rocket's flight last?
A) 6 seconds
B) 7 seconds
C) 8 seconds
D) 9 seconds

Lol idk ask google. ejie

1.   an exact solution requires a radical solution - no decimal approximation.2. (a)4x^3 = 756x^3 = 756/4 = 189x =   cube root of 189 =   5.74   to nearest hundredth answer(b)   189 = 3*3*3*7   so we can write the cube root of 189 as 3∛7 answerchecking (a) 4*(5.74^3 =   756.48   which is very close(b)   4* ((3∛3)^3   = 4*189   = 756   - spot on! 3. i would use solution b because the original question asked for an exact solution.