## Calculus 10th Edition

a.) $\gt$ b.) $\lt$
a.) Because the slope from the points (1,2), and (4,5) is greater than slope between (4,5) and (3,4.5), Then the sign used is $\gt$ b.) Because the tangent slope at $f'(1)$ is greater than the slope between the points (4,5) and (1,2) Then the sign used is $\lt$