4. At the Bronx Zoo, tickets for adults cost $28 and tickets for children cost $13. If 550 tickets are sold on Saturday for a total of $12,700, how many adult tickets were sold and how many children tickets were sold? 5. Write f(x) in vertex form. Then sketch the graph of f(x). f(x) = x-6x + 7. (a) Find the coordinates of the vertex. (b) Write the equation in vertex form. (c) State the axis-of-symmetry. (d) Find the intercepts. x-intercept(s):. y-intercept(s): (e) Sketch the graph, label the vertex, intercepts and axis of symmetry. 6. The table below compares the cost of hiring a taxi in NYC, NY and Chicago, IL in July 2017. City NYC, NY Initial Fare $2.50 Chicago, IL $3.25 Cost per Mile $2.50 $2.25 a) Write linear models that will calculate total taxi cost as a function of miles and use them to fill out the table below. Then, estimate the number of miles at which the costs of taxi in NYC and Chicago is approximately the same. Miles Traveled 0 1 2 3 4 5 Cost in NYC Cost in Chicago NYC: Chicago: b) Sketch both graphs, using the horizontal axis for Miles and vertical axis for the Cost, 3 c) Label and interpret the solution point on the graph. d) Solve the system algebraically by using either substitution or elimination method.