Sneakers are normally $80, but are on sale for $50. What percent of the original will you pay

Henry is an avid reader, he devours 90 pages in half an hour how many pages has henry read per minute?

The random variable x represents the number of phone calls an author receives in a day, and it has a poisson distribution with a mean of 8.7 calls. what are the possible values of x

Aquadratic equation in standard from is written ax^2= bx+c, where a, b and c are real numbers and a is not zero?