An rock is thrown upward from a platform that is 188 feet above ground at 80 feet per second. use the projectile formula to determine when the rock hit the ground.

6.74 s

Step-by-step explanation:

y = ½ at² + vt + h

Given a = -32, v = 80, h = 188:

y = ½ (-32) t² + (80) t + (188)

y = -16t² + 80t + 188

When y = 0:

0 = -16t² + 80t + 188

0 = 4t² − 20t − 47

Solve with quadratic formula:

t = [ -(-20) ± √((-20)² − 4(4)(-47)) ] / 2(4)

t = [ 20 ± √(400 + 752) ] / 8

t = (20 ± √1152) / 8

t > 0, so:

t = (20 + √1152) / 8

t ≈ 6.74

answer: a. 13/44

step-by-step explanation: judging by the information given to us, we are looking for experimental probability. we can see that 13 males have chosen chocolate ice cream. there are 44 ice creams in total (remember that the total is always the denominator). so our answer is 13/44.