Translate into an equation the sum of two times a number and 5 is 11

Which term best describes the association between variables a and b

9/10 divide by -3/15 as a mixed number

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.