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]