F(x)=-5t^2+20t+60
Divide everything by -5
f(x)=t^2-4t-12
(t-6)(t+2)
Set it up to zero
t-6=0. t+2=0
t=6. t=-2
Since you can’t have negative seconds, the answer is 6 seconds
It would be C because the 40° is acute and the last degree is obtuse
Answer:
I don't really understand what the question you are asking is, is there a question that goes along with this?
Answer:
B
Step-by-step explanation: