Arrange these numbers from least to greatest: -2.5, 2/5, 5/2, -5.2

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

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Which of the binomials below is a factor of this exression? 16x^2+40xy+25y^2 a.4x-5y b. 2x-5y c.4x+5y d.2x+5y