Problem Set 14
Name:______________________
Rea, 20067
Solve at least 8 problems on a separate sheet of paper, with this sheet attached to the front as a cover sheet. Show all work in detail, and be prepared to explain what you did to the class. 1) The mean of three different positive integers is 8. What is the largest integer that could be one of them? 2) Jay thinks that the inequality k < 3 implies the inequality k2 < 9, but Val thinks otherwise. Who is right and why? 3) A movie theater charges $6 for each adult and $3 for each child. If the total amount in ticket revenue one evening was $1428 and if there were 56 more children than adults, how many children attended? 4) A lattice point is defined as a point whose coordinates are integers. If (3,5) and (2,1) are two points on a line, find three other points on the same line. 5) Find the value for h for which the slope of the line through (5,6) and (h,12) is ¾. 6) Blair’s average on the first five tests is 67. If this is not pulled up to at least a 70, Blair will not be allowed to watch any more Star Trek reruns. To avoid losing those privileges, what is the lowest score Blair can afford to make on the last test? Assume all tests carry the same weight. 7) In each case, decide whether the three points given are collinear: a) (4,8), (0,2), and (2, 1) b) (350, 125), (500, 300) and (650, 550) 8) A horse thief riding at 8 mph has a 32mile head start. The posse in pursuit is riding at 10 mph. In how many hours will the thief be overtaken? 9) Draw the line through the point (0,6) whose slope is 2/3. If you move 24 units to the right of (0,6), and then move up to the line, what is the ycoordinate of the point you reach? Find the equation of this line.
10) Graph y = x + 3 and y = x - 5 , then describe in general terms how the graph y = x is transformed to produce the graph of y = x + k . How can you tell from the graph whether k is positive or negative?