6. [0/1 Points] DETAILS PREVIOUS ANSWERS BERRAPCALC7 5.6.019.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Find the indefinite integral by the substitution method or state that it cannot be found by our substitution formulas. (If it cannot be found by substitution, enter IMPOSSIBLE. Use C for the constant of integration.) et 4 x* dx 4 5 et + C 5 X Need Help? Read It Master It21. [0/1 Points] DETAILS PREVIOUS ANSWERS BERRAPCALC7 5.6.072. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER 17 During an automobile sale, cars are selling at the rate of cars per day, where x is the number of days since the sale began. How many cars will be sold during the first 8 days of the sale? (Round x + 1 your answer to the nearest whole number.) x cars Need Help? __' Submit Answer 15. [112 Points] DETAILS PREVIOUS ANSWERS BERRAPCALC7 6.1.047. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Find in two different ways and check that your answers agree. (Use C for the constant of integration.) /x(x 4)7 dx (a) Use integration by parts. (x4)9--1(x4)8+C y 1_ 9 (b) Use the substitution u = X 4 (so x is replaced by u + 4) and then multiply out the integrand. 1 (X 4)8 x Remember to use capital C. Need Help? __' 16. [0/1 Points] DETAILS PREVIOUS ANSWERS BERRAPCALC7 6.1.063. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Runners and other athletes know that their ability to absorb water when exercising varies over time as their electrolyte levels change. Under certain circumstances, the absorption rate of water through the gastrointestinal tract will be f(t) = Zt'e't/2 answer to one decimal place.) 2.5 x L Need Help? _ liters per hour, where t is the number of hours of exercise Find the number of liters of water absorbed during the first 3 hours of exercise. (Round your