exam Maths Puzzle Numerical Ability

can you help me set up this problem

the number of inquiries the first week was 15. the number of inquiries the fourth week was 79. find the average rate of change in number of inquiries from the first week to the fourth week.

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exam Other Question

From daughters [age 14] schoolbook with no ISBN.
x+1 over 3 = -x over 6

Thanks, you are great. I am learning lots from browsing here
Perform the indicated operation.

5x/x-1 MINUS 5/x-1


2x squared/x-4 MINUS 32/x-4