Which expression can be used to determine the average rate of change in f of x over the interval left bracket 2 comma 9 right bracket ?
A
f of open paren 9 minus 2 close parenB
the fraction with numerator f of open paren 9 minus 2 close paren and denominator 9 minus 2C
the fraction with numerator f of 9 minus f of 2 and denominator 9 minus 2