Megan gets ready to launch the same rocket from a platform 21 feet above the ground with the same initial velocity. How long will the rocket stay in the air this time? a. Write a function that represents the rocket’s path for this launch. b. Factor the corresponding equation to find the values for t when h is zero. c. Erin says that the roots of the equation are t 5.25 and t 20.25 and that the rocket will stay in the air 5.5 seconds. Megan says she is wrong. Who is correct? How do you know?

1. the manager of collins import autos believes the number of cars sold in a day (q) depends on two factors: (1) the number of hours the dealership is open (h) and (2) the number of salespersons working that day (s). after collecting data for two months (53 days), the manager estimates the following log-linear model: q 4 equation 1 a. explain, how to transform the log-linear model into linear form that can be estimated using multiple regression analysis. the computer output for the multiple regression analysis is shown below: q4 table b. how do you interpret coefficients b and c? if the dealership increases the number of salespersons by 20%, what will be the percentage increase in daily sales? c. test the overall model for statistical significance at the 5% significance level. d. what percent of the total variation in daily auto sales is explained by this equation? what could you suggest to increase this percentage? e. test the intercept for statistical significance at the 5% level of significance. if h and s both equal 0, are sales expected to be 0? explain why or why not? f. test the estimated coefficient b for statistical significance. if the dealership decreases its hours of operation by 10%, what is the expected impact on daily sales?