Pls hurry thomas wants to rent a lawn mower. he has to pay a fixed base cost plus a daily rate for renting the lawn mower. the table shows the amount of money, y, in dollars, that thomas has to pay for renting the lawn mower for x days.
number of days rent (dollars)
(x). (y)
0. 12
1. 21
2. 30
3. 39
4. 48

which equation best shows the relationship between x and y?

a.) y=x+21
b.) y=9x+21
c.) y=9x+12
d.) y=x+21