Question

transformar 20°c em °F

Answer 1

F-32 = C  
  9       5

F-32 = 20  
  9       5

F-32 = 4
  9

F - 32 = 4 . 9
F - 32 = 36
F = 36 + 32
F = 68 ºF 

Answer 2

Tf =1,8.Tc+32

Nesse caso:
Tf =1,8.20+32
Tf =68ºF