Question

No Rio de Janeiro, a temperatura ambiente chegou atingir, no verão de 1998, o valor de 21 C. Qual seria o valor dessa temperatura, se lida num termômetro na escala Fahrenheit ?

Answer 1

$\displaystyle \mathsf{\frac{\theta C}{5} = \frac{\theta F - 32}{9}}\\ \\ \displaystyle \mathsf{\frac{21}{5} = \frac{\theta F - 32}{9}}\\ \\ \displaystyle \mathsf{5(\theta F - 32) = 21.9}\\ \displaystyle \mathsf{5\theta F - 160 = 189}\\ \displaystyle \mathsf{5\theta F = 189 + 160}\\ \displaystyle \mathsf{5\theta F = 349}\\ \\ \displaystyle \mathsf{\theta F = \frac{349}{5}}\\ \\ \displaystyle \mathsf{\theta F = 69,8 ^{\circ}F}$

Resposta: 69,8 °F