`1-\left(-5\right)`

$1-(-5)=1+5=6$

To simplify the expression `1-(-5)`, follow these steps:

Step 1: Simplify the negative sign inside the parentheses
-(-5) = 5

Step 2: Evaluate the subtraction
1 - 5 = -4

Therefore, `1-(-5)` simplifies to -4.

To find the value of the expression `1-( -5)`, follow these steps:

Step 1: Simplify the expression within the parentheses first: the negative sign in front of the 5 means that we need to change its sign. So `-(-5)` is the same as `5`.

Step 2: Now, substitute the simplified expression back into the original expression: `1-5`.

Step 3: Perform the subtraction: `1-5` equals `-4`.

Therefore, `1-( -5)` is equal to `-4`.