5 colors without replacement from 9 distinct colors choices do and doesn’t matter

What is the binomial expansion of (2x-3)^5

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

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%