Section 3.1 Rectangular Coordinate System 219 26. A townhouse has a sprinkler system in the backyard.With the water source at the origin, the sprinkler heads are located at points A, B, C, D, and E. All distances are in feet. a. Estimate the coordinates of each sprinkler head. A10, 42, B116, 42, C116, 62, D18, 142, E10, 82 b. How far is the distance from sprinkler head B to C? 10 ft 27. A movie theater has kept records of popcorn sales versus movie attendance. a. Use the table shown to write the corresponding ordered pairs using the movie attendance as the x variable and sales of popcorn as the y variable. Interpret the meaning of the first ordered pair. (See Example 4.) (250, 225), (175, 193), (315, 330), (220, 209), (450, 570), (400, 480), (190, 185); the ordered pair (250, 225) means that 250 people produce $225 in popcorn sales. b. Plot the data points on a rectangular coordinate system. 600 550 500 450 400 350 300 200 150 100 C 0 0 50 100 150 200 250 300 350 400 450 500 550 Sales ($) Number of People 250 50 y x Movie Attendance Sales of (Number of People) Popcorn ($) 250 225 175 193 315 330 220 209 450 570 400 480 190 185 E D 24 20 16 12 4 8 12 28. The age and systolic blood pressure (in millimeters of mercury, mm Hg) for eight different women are given in the table. a. Write the corresponding ordered pairs using the woman’s age as the x variable and the systolic blood pressure as the y variable. Interpret the meaning of the first ordered pair. (57, 149), (41, 120), (71, 158), (36, 115), (64, 151), (25, 110), (40, 118), (77, 165); the ordered pair (57, 149) means that a 57-year-old woman has a systolic blood pressure of 149 mm Hg. b. Plot the data points on a rectangular coordinate system. 250 0 0 20 40 60 80 100 Systolic Blood Pressure Age 200 150 100 50 y x Age Systolic Blood (Years) Pressure (mm Hg) 57 149 41 120 71 158 36 115 64 151 25 110 40 118 77 165 242016128 4 x B A 16 4 y 8 4 8 12 Writing Translating Expression Geometry Scientific Calculator Video
miller_introductory_algebra_3e_ch1_3
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