the table of values represents a function f(x)
x f(x)
5 75
6 202
7 549
8 1491
9 4052
10 11,014
how much greater is the average rate of change over the interval [9,10] than the interval [5,8]?
Rate of change 9 to 10 = [ 4052 - 11014 ] / [ 9 - 10 ] = 6962
Rate of change 5 to 8 = [ 75 - 1491 ] / [ 5 - 8 ] = 472
So [ 6962 - 472 ] =
6490
Nice one
And yes it is as C-Phill said =6490
+509 
