Question

In City​ A, the temperature rises 4

Answer 1

The general expression for the change in temperature between 8am and 10am

$\delta_{8-10}= \delta_{8-9} + \delta_{9-10}$ where $\delta$ stands for change in the subscripted time interval.

For city A:

$\delta_{8-10} = 4 - 7 = -3\enspace ^\circ F$

For city B:

$\delta_{8-10} = -6 - 2 = -8\enspace ^\circ F$

In city A, there is an overall drop of 3 degrees (negative value). In city B, the temp drops 8 degrees.

Among A and B, city B has a greater change in temperature (8 vs. 3)