Answer: after 3 seconds
when the ball hit the ground => - 5t² + 14t + 3 = 0
⇔ (5t + 1)(t - 3) = 0
⇔ t = 3 or t = -1/5
but t is a positive integer => t = 3
so the ball will hit the ground after 3 seconds
Step-by-step explanation:
five eighths means 5/8
negative five eighths means -5/8
one half means 1/2
so 1/2 of negative five eighths means multiply 1/2 with -5/8

multiplying numerators together and denominators together,

So answer is -5/16
4 you can have 4 girls in one group with 4 in another