Combine like terms: 4x3-5x2+4x2-7x3-2x+3x2

Olga used 100 ounces of flour to make 225 muffins. how many ounces of flour will be used to make 300 muffins?

Consider the set of all four-digit positive integers less than 2000 whose digits have a sum of 24. what is the median of this set of integers?

How many terms does the polynomial x^2 y^2 have