D. 12.5
The equation to find the average rate of change is

To find the average rate of change between points (0,20) and (8,120) you need to plug it into the equation so it'll be

this simplifies to

which is 12.5
a= 6-2b-3c
then put that equation inside the first one and then the second one
you get -6*(6-2b-3c)+2b-3c=23
and 5*(6-2b-3c)+4b-3c=-12
14b-15c=59
14b-18c=18/*(-1)
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3b=41
Yes this is the correct answer
Answer:
D: 7800
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Step-by-step explanation: