29. a. The relation is not a function because 23 is paired with both 56 and 53. ( e. = 2.0667 + 292 .8869 S A) A {A ≥ b. f. Domain: 0} A (25) (25) = + g. 2.0667 S 292.8869 ≈ 344.5544 Sales are about $344,554. = −1.3355 + 86.1974 D p d. As the price of the jeans increases by $1, the demand for the jeans decreases by about 1.34 pairs per day. 31. The data do not follow a linear pattern so it would not make sense to find the line of best fit. c. the LINear REGression program, the line of best fit is: ( ) e. = −1.3355 + 86.1974 D p p { f. Domain: p 32. The data do not follow a linear pattern so it 0 ≤ ≤ 64} p would not make sense to find the line of best fit. Note that the is roughly 64.54 p-intercept and that the number of pairs cannot be negative. (28) (28) −1.3355 g. = + D 86.1974 ≈ 48.8034 Demand is about pairs. 30. a. The relation is not a function because 24 is paired with both 343 and 341. b. (1, (3, Using the ordered pairs 5) and 8) , the line 33. 2 2 of best fit is = 3 + y x or = 1.5x + 3.5 . y 7 c. Using the LINear REGression program, the The correlation coefficient is = 1 . This r line of best fit is: sense because two points completely determine a = + 2.0667 292 S A line. .8869
29. a. The relation is not a function because 23 is paired with both 56 and 53. e. S ( A) = 2.0667 A + 292 .8869 b. f. Domain: {A A ≥ 0} g. S (25) = 2.0667 (25) + 292.8869 ≈ 344.5544 Sales are about $344,554. c. the LINear REGression program, the line of best fit is: D = −1.3355 p + 86.1974 d. As the price of the jeans increases by $1, the demand for the jeans decreases by about 1.34 pairs per day. 31. The data do not follow a linear pattern so it would not make sense to find the line of best fit. e. D ( p ) = −1.3355 p + 86.1974 f. Domain: { p 0 ≤ p ≤ 64} 32. The data do not follow a linear pattern so it would not make sense to find the line of best fit. Note that the p-intercept is roughly 64.54 and that the number of pairs cannot be negative. g. D (28) = −1.3355 (28) + 86.1974 ≈ 48.8034 Demand is about pairs. 30. a. The relation is not a function because 24 is paired with both 343 and 341. b. 33. Using the ordered pairs (1, 5) and (3, 8) , the line of best fit is y = 3 x + 7 2 2 or y = 1.5x + 3.5 . c. Using the LINear REGression program, the The correlation coefficient is r = 1 . This line of best fit is: S = 2.0667 A + 292 .8869 sense because two points completely determine a line.
Downloadable-Solution-Manual-for-Precalculus-Concepts-Through-1.docx