An automobile factory is assembling cars and they need to have all of the parts in stock at the assembly line.

Each car needs four tires and a spare tire for the trunk.
If they produce c cars per day, what formula shows how to calculate the number of tires, t, needed?
A. C=4t+1 B. T=c+4 C. T=4c+1 D. T=5c

So, the statement tells you that each car needs 5 tires (4 and then a spare) then the answer is D. T= 5c