Writing to explain: eric estimated 28•48 by finding 30•50. his estimate was 1,500, but he says the actual product will be greater than that amount. is he correct ? explain how you know.

What kinds of numbers have an odd number of factors?

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.