Please help me choose the correct answer

Which product is positive a is 2/5 -8/9 -1/3 -2/7 b is -2/5 8/9 -1/3 -2/7 c is 2/5 8/9 1/3 -2/7 d is -2/5 -8/9 1/3 2/7

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?

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with