1.	Simplify 1 Simplify the following expression: $$ \left(4 - -6\right)\left(-1 - -5\right) - {\left(2 + 1\right)}^{2} $$ Correct Answer $$ 31$$ or 31.0000

2.	Simplify 2 Simplify the following expression: $$ \left({4}^{-4} - 4(-3)\right)2\left(-4 - 1\right) $$ Correct Answer $$ \frac{-15365}{128}$$ or -120.039

3.	Fractions 1 Simplify the following expression: $$ \frac{-1}{2} + \frac{-4}{6} $$ Correct Answer $$ \frac{-7}{6}$$ or -1.1666666666666665

4.	Fractions 2 Simplify the following expression: $$ \frac{\frac{5}{6}}{\frac{-3}{5}} $$ Correct Answer $$ \frac{-25}{18}$$ or -1.388888888888889

5.	Significant figures 1. Write the following to 2 significant figures: 0.000031906378 Correct Answer 0.000032 or $$3.2\times10^{-5}$$ 2. Write the following to 5 significant figures: 0.0011079390 Correct Answer 0.0011079 or $$1.1079\times10^{-3}$$

6.	Standard Form 1. Write the following in standard form to 3 significant digits: 2028130 Correct Answer $$2.03\times10^{6}$$ 2. Write the following in standard form to 5 significant digits: 574780 Correct Answer $$5.7478\times10^{5}$$

7.	Significant figures 1. Write the following in preferred standard form to 5 significant digits: 15.3447 Correct Answer $$15.345\times10^{0}$$ 2. Write the following in preferred standard form to 4 significant digits: 0.0239266 Correct Answer $$23.93\times10^{-3}$$

8.	Simplify 2 Simplify the following expression: $$ {\left(-1 - 1\right)}^{2} + \frac{-5}{-2}\left(-5 - -1\right) $$ Correct Answer $$ -6$$ or -6.00000

9.	Simplify 1 Simplify the following expression: $$ \left(-2 - 1\right)\left(-1 - 4\right) - {\left(5 - 6\right)}^{2} $$ Correct Answer $$ 14$$ or 14.0000

10.	Simplify 2 Simplify the following expression: $$ \frac{5}{6}\left(-5 + -5\right) - {\left(3 - -2\right)}^{2} $$ Correct Answer $$ \frac{-100}{3}$$ or -33.3333