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
Answer: y=-3x+29
Step-by-step explanation:
First put in y-intercept form to find the slope

Slope of the 1st equation is 1/3- the slope of the line perpendicular is the opposite reciprocal, so in the case it is -3
Use the point and the new slope to write the new equation in point slope format

Answer:
40 yd^2
Step-by-step explanation:
Add the square at the bottom to make one large rectangle. Subtract the square not included from that area to get the figure shown (see attachment).
Answer:
z to the 10th power
Step-by-step explanation:
Answer:
16
Step-by-step explanation:
Let's take a look.
So we have 3*2*2*2*2=48 glasses
if half used 2 and other half used 1... we have a sum of 2+1=3
so 48/3 = 16