Idon't get this word problem someone

Factor the polynomial 8y^2 - 72 btw "^" means exponent

Explain why the factor 1.5 is broke. into two numbers in the model.

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.