Hey! :)
you went on the roller coaster 7 times and the ferris wheel 5 times
Hope this helps! :)
Answer: 
Have attached the picture for explanation...
For this case we must simplify the following expression:

We apply distributive property on the left side of the equation:

We subtract 3n from both sides of the equation:

We subtract 6 from both sides of the equation:

We divide between 45 on both sides of the equation:

Answer:

My best Guess is
1.282 for upper . , -1.282 for lower.
Hope this Helps
-Dante