The cost to rent a car is $30 per day. Write an expression for the cost of renting a car d days. Make a table to find how much it will cost to rent a car for 3, 5, 7, and 10 days.

d = day
c = cost

c = 30d

Day(d) |  c = 30d        |  Cost(c)
3          |  90=30(3)      |  $90
5          |  150=30(5)    | $150
7          |  210=30(7)    |  $210
10        |  300=30(10)  | $300