Use These Equations to Convert Between the Two Systems $C = \frac { 5 } { 9 } ( F - 32 ) \quad F = \frac { 9 } { 5 } C + 32$

Multiple Choice

Use these equations to convert between the two systems. $C = \frac { 5 } { 9 } ( F - 32 ) \quad F = \frac { 9 } { 5 } C + 32$ Round answer to the nearest tenth of a degree if necessary.
-A square plywood platform has a perimeter which is 7 times the length of a side, decreased by 18. Find the length of a side.

A) 9
B) 1
C) 6
D) 3