There were 29 days in February 1984.
Answer:

--- Percentage increase
Step-by-step explanation:
Given
Let


So, we have:
--- Monday
--- One month later
Required
The function
The function is represented as:

In
, we have:


Rewrite as:

In
, we have:


Substitute 

Solve for b


Recall that:

Hence, the function is:

To get the monthly percentage increase (r), we have:

Compare to: 
So:

Make r the subject



Express as percentage


Answer:
15 months
Step-by-step explanation:
35x+20=545
Subtract 20 from both side to figure out how many months he paid for....
35x+20-20=545-20
35x=525
Divide 35 on both sides....
x=15
Therefore, he has been a member for 15 months
Check:
35(15)+20=545
525+20=545
545=545
IT'S CORRECT!!!
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I'm not sure what you do with the whole numbers but 0.8 is 80% and 82% is higher than 80% so its not 0.8