If 69 +69 +69 = 69 then what does 69 +69-69= plz help I need it

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

What is the factored form of the following expressions? d^2 – 13d + 36

1- 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.2- 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 the first question?