Membership in the volunteers club increased by 15% from last year. if the number of members last year was m, complete a simplified expression to represent the number of members this year. enter your answer in the box.

For this case what you can do is the following rule of three:
 m ---> 100%
 x > 115%
 Clearing the value of x we have:
 x = (115/100) * (m)
 x = 1.15 * (m)
 
 a simplified expression to represent the number of members this year is:
 x = 1.15 * (m)