Determine if the equation x^2-y=1 define y as a function of x
A yes one input results in one output
B-no at least one output results in two inputs
C- no at least one input results in two outputs
D-yes one output results in one input

When y’all answer can y’all explain too !

At the electronics store you have a coupon for 20% off up to 2 cds you buy for cds with the original cost of $10.99 each the sales tax is 5% what is the total cost of your purchase

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%