you have to work bacwards
No.1
[tex]c=\frac{5}{9}(F-32)[/tex]
[tex]c=60[/tex]
[tex]\frac{60}{\frac{5}{9}}=\frac{\frac{5}{9}}{\frac{5}{9}}(F-32)[/tex]
[tex]10.8=F-32[/tex]
[tex]42.8=F[/tex]
No. 2
[tex]c=27.5[/tex]
[tex]\frac{27.5}{\frac{5}{9}}=\frac{\frac{5}{9}}{\frac{5}{9}}(F-32)[/tex]
[tex]49.5=F-32[/tex]
[tex]81.5=F[/tex]
