the constant rate of change, or average rate of change, is just its slope, so we can just pick any two points to get it.

Answer:
$80 for 9 hours
Step-by-step explanation:
whichever instructor it is that does it for $80 for 9 hours.
I can't tell which rates belong to which instructor and Mark's name isn't listed by any rates......
but the $80 for 9 hours is the best deal per hour
It has a coefficient of 4 :)
Answer:
b^5
Step-by-step explanation:
b^ -6 * b^11
We know that a^c * a^d = a^ (c+d)
b^ -6 * b^11 = b^(-6+11)
= b^(5)