(C)
(D)19.(A)
(B)
(C)
(D)20.(A)
(B)
(C)
(D)y = sin x
y = e−x2Which of the following functions could have the graph sketched below?f(x) = xex
f(x) = xe−xQuestions 20–22. Use the graph below, consisting of two line segments and a quarter-circle. The
graph shows the velocity of an object during a 6-second interval.
For how many values of t in the interval 0 < t < 6 is the acceleration
undefined?
none
one
two
three