Ineed work on the question would be nice but not you for me! 13. a hotel in town has decided to host a huge justin bieber convention. the hotel has 260 rooms – some singles and some doubles. the singles cost $35 and the doubles cost $60. the sales for one night is $14,000. how many of each room did they sell? 14. farmer joe has cows and chickens on his farm. one day he counts 71 heads and 188 feet. how many cows and how many chickens are on the farm? 15. find the slope and y-intercept of -4x + 9y = 1216. simplify. 4a - 8 -(6 - 3a) -2(9a + 12)17. a garden is being constructed in the shape of a triangle. the base of the triangle is 12 feet. what should the height be to make the area 156 sq. ft.? 18. gregory teaches martial arts. he charges a one-time processing fee of $5.00 and the cost of the classes is shown below. based on this information, what will it cost to take 10 classes?