7. [-/1 Points] DETAILS TANAPCALC10 2.1.028. Find the domain of the function. (Enter your answer using interval notation.) f(x) = Vx - 19 Need Help? Read It 8. [-/1 Points] DETAILS TANAPCALC10 2.1.032. Find the domain of the function. (Enter your answer using interval notation.) 1 f (x ) = x2 + 2x - 24 Need Help? Read It9. [-/1 Points] DETAILS TANAPCALC10 2.1.051. Use the vertical-line test to determine whether the graph represents y as a function of x. 4 2 X -4 4 O Yes, it does. O No, it does not. Need Help? Read It Watch It 10. [-/1 Points] DETAILS TANAPCALC10 2.1.056. Use the vertical-line test to determine whether the graph represents y as a function of x. O Yes, it does. O No, it does not.11. [-/3 Points] DETAILS TANAPCALC10 2.1.066. Sales Taxes In a certain state, the sales tax 7 on the amount of taxable goods is 7% of the value of the goods purchased x, where both T and x are measured in dollars. (a) Express T as a function of X. T ( x ) = (b) Find 7(500) and T(3.45). (Round your answers to the nearest cent.) T(500) T(3.45) Need Help? Read It Watch It 12. [-/4 Points] DETAILS TANAPCALC10 2.1.072. Cost of Renting a Truck Ace Truck leases its 10-ft box truck at $40/day and $0.50/mi, whereas Acme Truck leases a similar truck at $35/day and $0.55/mi. f ( x ) = (a) Find the daily cost of leasing from each company as a function of the number of miles driven. (Let f(x) represent the daily cost of leasing from Ace Truck, g(x) the daily cost of leasing from Acme Truck, and x the number of miles driven.) g(x) (b) Sketch the graphs of the two functions on the same set of axes. 100 100 100 y 80 100 80 fix) 80 60 fix) 80 60 fix) 60 fix) 60 40 40 g(X 10 20 g(X 40 20 g(X 20 g(X 20 O 20 40 60 80 100 120 20 40 60 80 100 120 20 40 60 80 100 120 20 40 60 80 100 120 (c) Which company should a customer rent a truck from for 1 day if she plans to drive at most 70 mi and wishes to minimize her cost? O Ace Truck O Acme Truck