Triangles efg and qrs are similar. the lengths of the sides of efg are 72, 64, and 56. the length of the smallest side of qrs is 140, what is the length of the longest side of qrs?

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.