Answer:
11. 68.6 mph
12. 5/6 page (0.83)
Step-by-step explanation:
You simply divide them (remember the word "per" means divide).


X=-6
You get all the X to one side, and all the numbers to the other. Then divide. Work is shown in image below.
Because K is the midpoint of JL and JK = 18, KL must also equal 18. So the equation would be 3x - 15 = 36 because you add 18 + 18. You then add 15 to both sides to get 3x = 51. Then you divide by 3 on both sides to get x = 17.
The answer is A.
The reason being straight lines mean equal proportions, while curved lines are exponential or quadratic.