Answer:
9
Step-by-step explanation:
1 feet is 12 inches, so 12 feet is 12 * 12 = 144 inches.
If studs are placed 18 inches apart, in 144 inches, there will be:
[tex]\frac{144}{18}=8[/tex]
But remember, there is a stud at the very beginning (at 0 feet).
So in total there are going to be 9 studs