Cal added 2 3/8 cups of raisins. write this mixed number as a fraction greater than 1 in simplest form ( do it in 4th grade )

Me because some of question i don’t understand

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis. 3- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in part b?

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct