Question

Do not mind the line I didn’t mean to put that there.

Answer 1

55

Explanation:

Given the expression:

`13+23+12+7`

First, introduce parentheses as follows:

`=13+[(23+12)+7]`

Apply the commutative property of addition: 23+12 = 12+23

`=13+[(12+23)+7]`

Next, apply the associative property of addition: (12+23)+7=12+(23+7).

`\begin{gathered} =13+[12+(23+7)] \\ =13+[12+30] \end{gathered}`

We can then simplify further:

`=13+42`

By the commutative property of addition: 13+42=42+13

`\begin{gathered} =42+13 \\ =55 \end{gathered}`

The value of the given expression is 55.