Formula used: Order of operations (PEMDAS/BODMAS): Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right) Calculation: (17+15)÷2−11+16×4−28+13(−16+13) ⇒32÷2−11+16×4−28+13(−3) ⇒16−11+64−28+13(−3) ⇒16−11+64−28−39 ⇒5+64−28−39 ⇒69−28−39 ⇒41−39 ⇒2