Mrs. fisher has 91 watches at her store. she says she can put them into rows and columns without any watches leftover. mr. fisher says that she can only put them into one row. who is correct, and why? (working with prime and composites)

How do you answer this question? (step by step)

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Elizabeth claims that the fourth root of 2 can be expressed as 2^m since (2^m)^n = 2. find the values of m and n for the case where elizabeth's claim is true.