65 is the answer. m = slope = delta y / delta x
delta y = 520 - 325
delta x = 8 - 5
Be well.
Let

. Then

, and so as

, you have

. The limit is then equivalent to
6(2k-3) is the answer to this problem.
make a distributive
take the 6 out of the equation and u have remaining 2k-3. 6(2k-3)