Please help. Preparing for an upcoming exam.

Problem 1. (1 point) Problem 4. (1 point) Find A rumor is spread in a school. For 0 0, the time / 12 at which a fraction p of the school population has heard the rumor 4-x Answer(s) submissed: is given by "(p) = 1 x(1-x)" (incorrect) (a) Evaluate the integral to find an explicit formula for ? (p). Write your answer so it has only one In term. Problem 2. (1 point) (b) At time / = 0, five percent of the school population (p = 0.05) Calculate the integral has heard the rumor. What is a? 7x+3 72 -3x +2 Answer(s) submissed: (c) At time / = 1, fifty-six percent of the school population (p = 0.56) has heard the rumor. What is b? (incorrect) b= (d) At what time has ninety-five percent of the population (p = 0.95) heard the rumor? Problem 3. (1 point) Answer(s) submitted: Calculate the integral: (x+4)(x+3) dx = Answer(s) Submissed: (incorrect) Problem 5. (1 point) (incorrect) Calculate the integral: (er - 2 ) (er + 5 )" dx = Answer(s) submitted: (incorrect)