Please excuse my dear aunt sally?

Answer 1

This refers to the order of operations to perform when doing complex equations.

PEMDAS

Parentheses - first (from the inside out)

Exponents second (unless they are inside the parentheses)

Multiplication and Division third

Addition and Subtraction from left to right last(unless they are inside parentheses)

examples:

4-2+1 =3 addition and subtraction from left to right

4-(2+1) = 1 parentheses says do the addition first

4+3x2 = 10 multiplication first

(4+3)x2 = 14 Parentheses first

4e3+5x 4-2e3 = -82 exponents first, multiplication, then addition/subtraction

left to right

(4e3 +5)x(4-2)E3 = 552 parentheses first, but exponent inside parentheses

comes first 4e3=64, then add the 5, then 4-2=2, then do the

exponent outside parentheses 2e3=8, then multiply 69 x 8 = 552