Answer :
To solve the word problem, we need to determine how many invitations Kayla has already mailed.
First, let's break down the information provided:
- Kayla is planning to send out invitations to a total of 20 friends.
- There are 12 invitations that have not been mailed yet and are still left to send out.
We want to find out how many invitations Kayla has already mailed. Let's use an equation to help us solve this.
If we let [tex]\( x \)[/tex] represent the number of invitations already mailed, we can use the following equation:
[tex]\[ x + 12 = 20 \][/tex]
Here's why this equation works:
- [tex]\( x \)[/tex] is the number of invitations already mailed.
- 12 is the number of invitations left to send.
- The total number of invitations adds up to 20.
Now, let's solve the equation:
[tex]\[ x + 12 = 20 \][/tex]
Subtract 12 from both sides to solve for [tex]\( x \)[/tex]:
[tex]\[ x = 20 - 12 \][/tex]
[tex]\[ x = 8 \][/tex]
Therefore, Kayla has already mailed 8 invitations. The equation we used is [tex]\( x + 12 = 20 \)[/tex], which corresponds to option D.
First, let's break down the information provided:
- Kayla is planning to send out invitations to a total of 20 friends.
- There are 12 invitations that have not been mailed yet and are still left to send out.
We want to find out how many invitations Kayla has already mailed. Let's use an equation to help us solve this.
If we let [tex]\( x \)[/tex] represent the number of invitations already mailed, we can use the following equation:
[tex]\[ x + 12 = 20 \][/tex]
Here's why this equation works:
- [tex]\( x \)[/tex] is the number of invitations already mailed.
- 12 is the number of invitations left to send.
- The total number of invitations adds up to 20.
Now, let's solve the equation:
[tex]\[ x + 12 = 20 \][/tex]
Subtract 12 from both sides to solve for [tex]\( x \)[/tex]:
[tex]\[ x = 20 - 12 \][/tex]
[tex]\[ x = 8 \][/tex]
Therefore, Kayla has already mailed 8 invitations. The equation we used is [tex]\( x + 12 = 20 \)[/tex], which corresponds to option D.
