Question

Corresponding range of Celsius temperature C

Answer 1

By rearranging the equation, we find that 45 = 9/5 C +32 and 85 = 9/5 C +32
Therefore the answer is, 7.22 < C < 29.44

Answer 2

As the formula says F = (9/5)C + 32 which is the equal to the following:

F - 32 = (9/5)C   =>   C = (F-32)*5/9

F1 = 45
F2 = 85

in Celsius they will be:
C1 = (45 - 32)*5/9 = 13*5/9 = $13\frac{5}{9}$
C2 = (85 - 32)*5/9 = 53*5/9 = $53\frac{5}{9}$

And the answer will be:

$13\frac{5}{9}$ < C < $53\frac{5}{9}$