Simplify the following expressions: e) (3)2 2 - 22 3, f) 5 * (2 + 3)2 + 13, a) 62 - 42 - sqrt(9).

$$(3)^2 = 9$$ $$2^2 = 4$$

$$9 \times 2 = 18$$ $$4 \times 3 = 12$$

$$18 - 12 = 6$$

The simplified expression is:

$$\boxed{\text{6}}$$

$$5^2 = 25$$ $$1^3 = 1$$

$$125 + 1 = 126$$

The simplified expression is:

$$\boxed{\text{126}}$$

Activity 2, a) Simplify $6^2 - 4^2 - \sqrt{9}$.

$$6^2 = 36$$ $$4^2 = 16$$ $$\sqrt{9} = 3$$

$$36 - 16 = 20$$ $$20 - 3 = 17$$

The simplified expression is:

$$\boxed{\text{17}}$$