The school's enrollment dropped 12.8% from last year. this year's enrollment was 252 students. what was last year's enrollment?

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

Graph the system: f(x)= 3/x-2; f(x)= 1/2x + 2

Our goal is to collect email addresses from 60% of customers who purchase a product." so that means if i talk to 95 customers, i need to persuade to provide an email address?