Let f(x)=logx what is the average rate of change of f(x) from 4 to 6? Round to the nearest hundredth

0.09
0.18
0.20
0.41

Darcy deposited $390 into a savings account. as long as the account balance remains at or above $150, she does not have to pay a service fee for the account. for how many months can she withdraw $40 a month without having to pay service fees? a) 3 b) 5 c) 6 d) 9