Exercises with Answers

290 Chapter 3 Linear Functions13.a)salary S (thousands of dollars)50f) It will take 40 months for him to reach$2000.h)1600savings S (dollars)40302010(0,39)15001400130012001100Anne−MarieEnrique0 2 4 6 8 10b) (0, 39)c) 1d) S = t + 39e) S(t) = t + 39time t (years)f) $49000, $59000, $69000, and $89000g) 79h) If the current rate of increase continues,in 40 years Kate’s salary will be$79, 000.15.a) t should be the independent variableand S should be the dependent variable.b) S-intercept = (0, 1000); slope = 25c) S = 25t + 1000d) S(t) = 25t + 100010000 2 4 6 8 10 12 14time t (months)i) The lines have the same slope; theyare parallel.j) S = 25t + 1200k) S(t) = 25t + 1200l) They are lines because they are in they = mx + b form. They are parallelbecause their slopes are equal (bothare 25).m) It should take her less time.n) It will take 32 months for her to reach$2000. This agrees with our expectationfrom (m).17.a) v = 32tb) v = 160 feet per secondc) t = 8 secondse) 1300Version: Fall 2007