Need help wit problem

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)

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

Acircle has a circumference of 28.36 units what is the diameter of the circle