Give two examples that show how using parentheses can change the order in wich operations are performed in an expression

This is because of the order of operations:

Parentheses

Exponent

Divide

Multiply

Add

Subtract

Note that parentheses are the first, so it will affect everything after it.

Examples:

2 (5+4) = 2x9 = 18

(2x5) + 4 = 10+4 = 14

5 / (2+3) = 5/5 = 1

(5/2) + 3 = 2.5+3 = 5.5

(4 + 2) / 36 = 1/6

4 + 2/36 = 4 + 1/18 = 72/18 + 1/18 = 73/18

(5 - 3) / 4 = 1/4

5 - 3/4 = 20/4 - 3/4 = 17/4