Question 535644
The equation will be of the form F = mC + b, where F = the Fahrenheit temperature, C = the Celsius temperature
Substituting the values for the two points gives:
32 = m*0 + b -> b = 32
212 = 100m + 32 [we use the value b = 32 derived above]
Solving for m gives 
m = (212-32)/100 = 1.8
a) F = 1.8C + 32
b) Let F = C = T
T = 1.8T + 32
-0.8T = 32 -> T = -40
c) F = 1.8*65 + 32 -> F = 149