Steve repairs elevators. when he is called to a job he uses the stairwell to go to the floor on which the elevator is located. in the modis building, he climbs 22 steps for every 15 feet of horizontal travel. in the sears tower, he climbs 17 steps for every 7 feet of horizontal travel. part a. what is the rate of change for each stairwell? part b. which stairwell will be easier to climb? explain your reasoning.

Aconcession manager at yankee stadium wants to know how temperature affects beer sales. she took a sample of 10 games and recorded the number of beers sold and the temperature in the middle of the game. temperature 80 68 78 79 87 74 86 92 77 84 number of beers 20533 1439 13829 21286 30985 17187 30240 87596 9610 28742 a. draw a scatter plot of the data. b. the manager estimates the regression equation to be: numberofbeers = −100, 678 + 1, 513 ∗ temperature draw this on your scatter plot. c. for one of the estimated points, indicate the residual with ei . d. for that same point, indicate what part of the variation is explained by the model with ˆyi − y¯.