Question

The same rule is used for addition/subtraction. Answer each question below.

-13 + 4 - 18 =
12-(-9) +(-6) =

Answer 1

-13 + 4 - 18 = -27

12 - (-9) + (-6) = 15

Explanation:

Use PEMDAS:

P Parentheses first

E Exponents (ie Powers and Square Roots, etc.)

MD Multiplication and Division (left-to-right)

AS Addition and Subtraction (left-to-right)

and

(-)(-) = (+), (-)(+) = (+)(-) = (-), (+)(+) = (+)

-13 + 4 - 18 = (-13 + 4) - 18 = -9 - 18 = -27

12 - (-9) + (-6) = 12 + 9 - 6 = 21 - 6 = 15

Answer 2

Hi I do not fully understand your question, but I think PEMDAS can be used here.

Explanation:

1. Parenthesis first

2. Solve the problem left to right

3. -13+4= -9; -9-18=-27

4. -(-9)= +9; 12+9= 21

5. +(-6)=-6; 21-6= 15

6. Answers are: -27 and 15

Please feel free to correct me if I am wrong or ask me questions!