Evaluate 6 - e + f if e=3 and f =9

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?

Consider the set of all four-digit positive integers less than 2000 whose digits have a sum of 24. what is the median of this set of integers?

12 out of 30 people chose their favourite colour as blue caculate the angle you would use for blue on a pie chart