Question

1.) Simplify
21- (-7)
7

Answer 1

28

Explanation:

To simplify the expression 21 - (-7), we can follow these steps:

Step 1: We have a negative sign before the parentheses. To simplify this, we change the subtraction inside the parentheses to addition. So, -(-7) becomes +(7).

Step 2: Now, the expression becomes 21 + 7.

Step 3: Adding 21 and 7 gives us 28.

So, 21 - (-7) simplifies to 28.