The last two operations in P.E.M.D.A.S are 'addition' and 'subtraction'.
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Order of operations--Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction. 15-2x2 (fifteen minus two times two) 15-4 11
It means: First, Outers, Inners, Last and is the order of operations when multiplying out bracket in algebra
F = First O = Outside I = Inside L = Last It's for the Order of Operations
Subtraction. Remeber it's PEMDAS. Parenthesis, Exponent, Multiplication, Division, Addition and Subtraction.
Because if you did operations in an impermissible order, or violated laws of operations, then your solution to the equation is wrong.