What is the answer to this problem? 8x-1=5x-1+3x

What situation is an example of an observational study

Acircle has a circumference of 28.36 units what is the diameter of the circle

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%