A set of math tests is normally distributed with a mean of 81 and a standard deviation of 5. If Adam’s z-score was -0.6 and Leah’s z-score was 2.2, how many points higher did Leah score than Adam?

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

Plz hurry evaluate the expression a+b where a=8 and b=19

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)