Question

Membership in an art club is expected to grow by about 4% per month Currently there are 350 members in the club in about how many months will membership reached 500 members

Answer 1

The first step is to find 4% of 350.
0.04x350=14
This means that at 4% increase each month the club will grow by 14 members. 
The next step is to find out how many members would be needed to increase the club to 500 members.
500-350=150members

To calculate the total months, 150members should be divided by 14members.
150/14=10.71months

Rounded to the nearest ten the answer would be 11months.