I need help anyone know how to

Nneeedd 1.find the residual if you know the actual number is 5.2 and the predicted value is 4.8

Compare the cost of the bike trips from the two companies shown. for both the cost in a linear function of the number of days which statements is true

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?