Answer :

8.06 because 64 ÷8=8 and .48÷8=.06
INOEVREing
fx=1/8
FPrime(x)=1/8
b=64.48 ,a=64 ,h=0.48
Fa=8
f/a=1/8
F/a.h=0.48/8=0.06
64.84/8~=8+0.06=8.06

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