Any help would really be appreciated:

Express the distance from point (x,y) on the graph y = 4 - x^2 to the point (0,1) as a function of x. Give the domain of the function.

2. compute the difference quotient for (f(x+h) - f(x))/h for f(x) = 3x + 8, and f(x) = 1/x^2