Answer:
36
Step-by-step explanation:
1. Cross Multiply. 
2. Solve. 
3. Your answer is 36
If you are taking the cm to km then it would be like this
4.5km*4.1cm= 18.45km
The horizontal change is called the run and the vertical is rise. so for example if one point to the other rises by 4 and runs by 5, the slope is 4/5. slope is
rise / run
Plug one intercepts: (-1)^2+(-1)b+5=0
(-5)^2+(-5)b+5=0
simplify: 6-b=0
30-5b=0
solve for b: 6=b
30/5=b