Answer:
A!
Step-by-step explanation:
The answer is 12 percent change
You multiply $15 by 23 which is 345. Then you multiply 345 by 52 for there is 52 in a year. The answer $17940.
Assuming you meant is

The answer would be :




Hope this helps !
Photon
However, your equation seems weird :o
T=21+4.5X
21 is the original temp.
4.5 is the constant rate I got when I subtracted 75-21=54 then divided 54/12min=4.5.
75 =21 + 4.5(12)