Check the picture below.
thus is at 0 = -16t² + 96t +640,

well, clearly it can't be a negative value for the elapsed seconds, so it can't be -4.
Answer:
-7
Step-by-step explanation:
Answer:
⇒
×3
⇒
Step-by-step explanation:
Answer:
no I think not I have study it at 1 year ago
You would use, Order of Operations, A.K.A PEMDAS.
Parenthesis, Exponets, Multiplication, Division, Addition, Subtraction
Follow that order and you do the work yourself, you would never learn by asking other's for the answer. >:)
From: Dark Angel