Name: SUMMER II, 2014 MATH 142:203 QUIZ - 7 • This is a group quiz, in class, open notes, open books. • Read each question carefully, answer each question completely, box your answers. • Show all of your work; no credit will be given for unsupported answers. 1) Find the derivatives of these functions: a) (3 pts) √ f (x) = π 2x+1 . b) (3 pts) g(x) = log5 (xe3x ). 2) Given E(p) = p . 50 − p a) (2 pts) Is the demand elastic or inelastic when p = 30? b) (2 pts) If the price is decreased by 20%, what is the approximate change in demand?