13 - 2 (1-15) divided by 4

We can solve this expression by following the order of operations, which is commonly known as PEMDAS (Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction).

First, we solve what is inside the parentheses:

1 - 15 = -14

Next, perform the multiplication:

13 - 2(-14) divided by 4

Multiplying 2 by -14 gives -28:

13 - (-28) divided by 4

Next, perform subtraction:

13 + 28 divided by 4

Now, divide 28 by 4:

13 + 7

Finally, perform addition:

13 + 7 = 20

Therefore, 13 - 2(1-15) divided by 4 equals 20.