Ryan ran "r" miles.
Jack ran 4 miles more than Ryan so he ran r+4 miles
sum equals 26 miles
r + r + 4 = 26
2r + 4 = 26
2r = 26 - 4
2r = 22
r = 22/2
r = 11 miles
The order of operations is a set of rules that define which operations you perform first to evaluate a mathematical expression..
remember the acronym PEMDAS
Parenthesis - You start by doing math in parenthesis
Exponents - Next do any exponents or radicals
Multiplication & Division - Then do multiplication or division
Addition & Subtraction - last do any left over addition or subtraction
example:
(2+3)² + 3 × 4 ÷ 6 - 1 = ??
parenthesis
(5)² + 3 × 4 ÷ 6 - 1 = ??
exponents or radicals
25 + 3 × 4 ÷ 6 - 1 = ??
multiplication/division (3 × 4 ÷ 6 = 2)
25 + 2 - 1 = ??
addition/subtraction
26
