Please help me with thiss

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

What is the average rate of change for this function for the interval from x=2 to x=4 ?

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20