Two times a number added to another number is 25. three times the first minus the other number is 20

To which sets of numbers does -12 belong? choose all answers that are correct. a) natural numbers b) integers c) real numbers d) irrational numbers

Carl's candies has determined that a candy bar measuring 3 inches long has a z-score of +1 and a candy bar measuring 3.75 inches long has a z-score of +2. what is the standard deviation of the length of candy bars produced at carl's candies?

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents