Please answer this and help me out:) ^

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

A. plot the data for the functions f(x) and g(x) on a grid and connect the points. x -2 -1 0 1 2 f(x) 1/9 1/3 1 3 9 x -2 -1 0 1 2 g(x) -4 -2 0 2 4 b. which function could be described as exponential and which as linear? explain. c. if the functions continue with the same pattern, will the function values ever be equal? if so, give estimates for the value of x that will make the function values equals. if not, explain why the function values will never be equal.

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?