To solve equations like this we need to do inverse operations.
First we need to build an equation: 9+3x=21
We pass the nine to the other side, subtracting the 9 to 21, that leaves us with 3x=12
After that we just divide 12 by 3, wich gives us x=4, or, as it says in the question: n=4
Now let's double check:
N=4, since 3*4=12 and 12+9=21
Hope it is helpful :)
1.5 hr = 90 minutes
90 min = $9 extra dollars?
Not 100 percent sure - but hopefully this helps you
Answer:
The answer is (C.)
Step-by-step explanation:
