What is 10% subtract from 20,000?

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.

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

The surface area of the triangular prism is .