21-{-7}=
i need help with this.
28
21 - (-7) = 21 + 7 = 28
thanks that makes sense.
To solve the expression 21-{-7}, you can follow these steps:
Step 1: Start by understanding the expression. The term inside the braces {-7} indicates a negative value.
Step 2: Determine the operation to perform between the numbers. In this case, it is subtraction (-).
Step 3: Perform the subtraction operation. When subtracting a negative number, it is equivalent to adding the positive value. So, 21-(-7) is actually 21+7.
Step 4: Calculate the result. When you add 21 and 7, you get 28.
Therefore, 21-{-7} equals 28.