Answer
a. P
b. Q
c. R
Work Step by Step
At P, the graph momentarily neither rises nor descends (slope=0)
At Q, it rises (tangent slope is positive)
At R, it rises (tangent slope is positive)
The slope at R is less steep than at Q (both are positive)
then, the slope at R is 1, and at Q, it is 3)
So, we arrive at the answers:
a. P : slope 0
b. Q : greater of the two positive slopes, (3 and 1)
c. R : smaller of the two positive slopes, (3 and 1)
