The average cost of a compact car at a certain dealership over the last 10 years has ranged from $14,000 to $18,500. Suppose you were going to plot these points on a coordinate grid.

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

What is the standard form of -5x^2+2x^4-11+x^3+3x

Tim's phone service charges $23.06 plus an additional $0.22 for each text message sent per month. if tim's phone bill was $28.56, which equation could be used to find how many text messages, x, tim sent last month?