The table shows how the cost of a tractor repair depends on the time needed for the repair.
Repair time Cost
(hours ) (dollars)
ーーーーーーーーーー
2 I 180
5 I 450
? I 630
10 I 900
20 I 1,800
Which expression can be used to find the number that is missing from the third row of the table?
A. 450➗5
B. 630➗7
C. 450➗90
D. 630➗90