Please answer 7-10 and show work

C Find the composition of functions defined and state the domain of the composite function showing your work. (See Ex. 7) 7 f(x) = 2x + 3 and g(x) = -x2 + 5, find (go g)(x). 8 f(x) = x + 3 and g(x) = Vx, find g(f(x)). 9 f(x) = x - 1 and g(x) = 3/(x-1), find f(9(x)). D Apply Your Knowledge (See Ex. 8.) 10 You go to a local mechanic to get your tires changed. The tires cost x dollars. There is a 6% sales tax, but you get a 10% discount. A Write a function t(x) for the total purchase amount after taxes but before discounts and fees. B Write a function d(x) for the total after discounts on purchase amount x but before taxes and fees. C Does it make a difference in the total price whether the mechanic adds the tax first d(t(x)) or takes the discount first t(d(x))? Do not replace x with a numerical value. Show the work to support your answer while keeping x in your work