What is $(3+3+5)\div2 - 1\div2$ in simplest terms?
To simplify this expression, I need to follow the order of operations: parentheses, exponents, multiplication/division, and addition/subtraction. Inside the parentheses, I have addition, so I can add up the numbers: $(3+3+5)\div2 - 1\div2 = (11)\div2 - 1\div2$. Now I have two fractions with the same denominator, so I can subtract the numerators and keep the denominator: $(11)\div2 - 1\div2 = (11-1)\div2 = 10\div2$. Finally, I can simplify this fraction by dividing both the numerator and the denominator by 2: $10\div2 = 5$. 