Answer:
-420
Step-by-step explanation:
A 3rd degree polynomial of any sort times a 4th degree polynomial of any sort will result in a 7th degree polynomial.

F =

c + 32 Subtract 32 from both sides
F - 32 =

c Mutliply both sides by <span>

to cancel out the fraction
</span>

F - 17

= c Switch the sides to make it easier to read
c =
F - 17 <span>
</span>