Answer:
1 hour ago would be 3C.
3 hours ago would be 9C.
4.5 hours ago would be 13.5
Step-by-step explanation:
To see how they are related, let us solve the two equations.
FIRST EQUATION



SECOND EQUATION



Hence the solutions to the two equations are ADDITIVE INVERSE of each other.
Answer:
x would be 1
Step-by-step explanation:
(13•4) + (3•8) +3 = 79
The total cost is $79