Remember to follow PEMDAS.
First, solve the parenthesis.
(1 - 15) = -14
13 - 2(-14) ÷ 4
Next, multiply -2 and -14 (remember to bring the signs.
-2 x -14 = 28
13 + 28/4
Next, divide
28/4 = 7
13 + 7
Finally, subtract
13 + 7 = 20
20 is your answer
hope this helps