Respostas

2014-03-29T16:07:28-03:00
Resposta

 \frac{F - 32}{9} =  \frac{C}{5}

 \frac{172 - 32}{9} = \frac{C}{5}

 \frac{140}{9} = \frac{C}{5}

9C = 5.140

9C = 700

C =  \frac{700}{9}

C = 78ºC

Letra B
1 4 1