Did you misspell the title ? What does th mean?
First off, you can start with the 36 and 45. If 45 is 3/4 of 1 hour, divide it and 36 by 3. Now we have 15 minutes, (1/4 hour) and 12 miles. Lastly, to find mph, we can do *4 and we get 4/4 hours, (1 hour) and 48 miles.
The answer to your question would be 10.5
Because 3/2 = 1/2 and 1/2 = 0.5 so nine plus 3/2 would equal 10.5 make sense?
6 is the x-intercept.
Hope this helps!