Sherita was collecting money for charity by walking in a walk-a-thon she asked for $0.75 for every mile she walked how much did sherita earn if she walked a total of 2.75 miles

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Candy lives in the center of town. her friend darlene lives 28 miles to the east and her friend dana lives 21 miles north. approximately how far do dana and darline live apart ?

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.