Everything was marked down 30%. the oringinal price of a manatee hat was $18. what was the clearence price

Simplify (4x^2 - 8xy + 2y^2) - (9x^2 - 4xy - 7y^2) a. -5x^2 + 4xy + 9y^2 b. -5x^2 - 4xy + 9y^2 c. -5x^2 + 12xy + 4y^2 d. -5x^2 - 4xy - 5y^2

Matt had 5 library books. he checked out 1 additional book every week without retuening any books. whats the matching equation

How do you find the distance of each number from the mean