Which number produces an irrational number when multiplied by 1/2

Jose predicted that he would sell 48 umbrellas. he actually sold 72 umbrellas. what are the values of a and b in the table below? round to the nearest tenth if necessary

Janice determined there were 10 possible outcomes when tossing two coins and spinning a spinner numbered 1 through 6. what is the correct number? what might have been janice's error?

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol