The table of values represents a polynomial function f(x). how much greater is the average rate of change over the interval [7, 9] than the interval [4, 6] ?

Average rate = (f(final)-f(initial))/(x(final)-x(initial))
the interval [7, 9] 
av. rate =(3878-1852)/(9-7)=1013
the  interval [4, 6] 
av. rate =(1178-358)/(6-4)=410
1013-410=603 greater the average rate of change over the interval [7, 9] than the interval [4, 6]

Dbc if u do the math and stuff that what i got let me know if i was wrong