1.	Simplify 1 Simplify the following expression: $$ 2(-5)(-5) - \left(4 - 6\right)\left(-2 - -3\right) $$ Correct Answer $$ 52$$ or 52.0000

2.	Simplify 2 Simplify the following expression: $$ {\left(3 - -4\right)}^{2} + 3 + 3 - 2\times1 $$ Correct Answer $$ 53$$ or 53.0000

3.	Fractions 1 Simplify the following expression: $$ \frac{-2}{5} - \frac{-5}{2} $$ Correct Answer $$ \frac{21}{10}$$ or 2.1

4.	Fractions 2 Simplify the following expression: $$ \frac{5}{5}\frac{-1}{6} $$ Correct Answer $$ \frac{-1}{6}$$ or -0.16666666666666666

5.	Significant figures 1. Write the following to 5 significant figures: 0.00056486135 Correct Answer 0.00056486 or $$5.6486\times10^{-4}$$ 2. Write the following to 3 significant figures: 6337.2751 Correct Answer 6340 or $$6.34\times10^{3}$$

6.	Standard Form 1. Write the following in standard form to 3 significant digits: 0.00000251985 Correct Answer $$2.52\times10^{-6}$$ 2. Write the following in standard form to 5 significant digits: 0.00000907779 Correct Answer $$9.0778\times10^{-6}$$

7.	Significant figures 1. Write the following in preferred standard form to 5 significant digits: 0.000622263 Correct Answer $$622.26\times10^{-6}$$ 2. Write the following in preferred standard form to 5 significant digits: 0.00216748 Correct Answer $$2.1675\times10^{-3}$$

8.	Simplify 2 Simplify the following expression: $$ \frac{2\left(-4 - -4\right)}{\frac{2}{-3} + \frac{-2}{-6}} $$ Correct Answer $$ 0$$ or 0.0

9.	Simplify 1 Simplify the following expression: $$ 2(-4) - \left(-3 + -2\right)\left(1 - 5\right) $$ Correct Answer $$ -28$$ or -28.0000

10.	Simplify 2 Simplify the following expression: $$ \frac{\left(-5 + -4\right)\left(1 - -5\right)}{{\left(3 + -5\right)}^{2}} $$ Correct Answer $$ \frac{-27}{2}$$ or -13.5000