$-7/2, -2.1,\sqrt 5, \sqrt9, 3.5$
Work Step by Step
To solve this problem, you can just put it into decimal notation. 3.5 is already in decimal notation, as is -2.1. Moving on, you can simply $\sqrt9$ to 3. Change -7/2 into -3.5, and finally approximate $\sqrt5$ using decimal notation. You will get $\approx2.24$. Finally, just reorder these numbers from least to greatest.