"one more than the product of a number and negative nine is negative eighty?" is not a question, despite the incorrectly used question mark. Therefore, it cannot have an answer. Hint: "one more than the product of a number and negative nine is negative eighty" is a statement that is either true or false, depending on the value of "a number". So, what do you think the question should be?
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it
