Which value is a solution for 4m = -132

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

I’m stuck on this equation, anyone got the answer?

One of every 20 customers reports poor customer service on your company’s customer satisfaction survey. you have just created a new process that should cut the number of poor customer service complaints in half. what percentage of customers would you expect to report poor service after this process is implemented? 1.) 5% 2.) 10% 3.) 2% 4.) 2.5%