Answer:
minimum value of z is 0
Step-by-step explanation:
if x and y both equal zero, then the value of z is zero, which is your answer.
10 1/2 I am pretty sure its right
The charge on each house is 8 units

d - distance
v - speed
t - time
Car A:

Car B:
15 mph faster than car A

Both cars traveled equal distances:

Car B traveled at the speed of 60 mph.