Maria said the expression −5n 2 7n−9 is equivalent to −5n. What error did Maria likely​ make?

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

Which expression is equal to (21)(7)(3x) using the associative property? (21 · 7 · 3)x (7)(21)(3x) 32(7 + 3x) (3x)(7)(21)

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²