12. Sketch the graph of h(x) = 7x-7x - 7x+7. 13. When the price of a certain item is given by p, the quantity sold will be given by q = 150 - 3p. Find the price that results in the maximum revenue (HINT: revenue = pq). 14. Oscar is selling car toys and it costs him 20 cents to make each toy. If he charges 60 cents per toy, then 70 kids will buy. If he charges 2.00 dollars per toy then only 35 kids will buy. Assuming that the number of kids who buy toys is a linear function of the price. What should Oscar charge to maximize his profit? 15. You have 50 cm of wire, and you have to use part of this wire to make a rectangle that's twice as long as it is wide, and the rest of the wire (if there is any left) to make a square. What should the dimensions of the shapes be if you want the total area to be as small as possible? What if you want the total area to be as large as possible? 16. Among all the numbers whose difference is 12, find the pair with the smallest product. What is the smallest product?