Answer:
day 14 , 450 dollars
Step-by-step explanation:
We called x is the number of days
Zippy Rent-a-car: 25x + 100
Speedy Rent-a-car: 30x + 30
25x + 100 = 30x + 30
25x -30x = 30 - 100
-5x = -70
x = 14
14 days
&
y=25x+100
y=30x+30
y=(25*14)+100
y=350+100
y=450
y=(30*14)+30
y=420+30
