Please help me out with the question

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

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%

3x + 4y = 5 x- 3y = -7 solve by substitution