D=20-1.95c how would i work this out correctly

What is the celsius temperature that is equal to 94 degrees fahrenheit using the formula f=9/5 c+32

What is the measure of angle afe? 79 81 91 99

In two or more complete sentences, formulate how to use technology to calculate the appropriate regression model for the given data. you are not required to find the model, just choose the appropriate regression and explain how to use the technology. (-5,,2.,0.8), (0,-0.5), (2,-1.3), (3,-0.8), (5,2)