x is the independent variable, and in this scenario, the independent variable is the number of days overdue. So the best equation would be where x is the number of days overdue, and y is the cost in cents.
Example equation:
x = number of days overdue
y = cost in cents
z = total price
z = yx
0.17 in 1 hour
0.34 in 2 hours
0.51 in 3 hours
0.68 in 4 hours
Question (18):
Answer: (A) All of the following
(I am using
in place of conj(z)

Question (19):
Answer: (B) -7
modulus of -7 is sqrt(49)=7
the other choices are all < 7
$58-$25=x this would be the equation i believe
The answer is 7 R 4! hoped this helps!