18. In the figure below, triangle ABC is a right triangle and m angle A=40^ A 40 degrees E с B D What is m angle ECD ?

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80%

Step-by-step explanation:

You have to find the rate for the bike so you divide 30 by 2 and you get 15. After you do that, you make a problem to find the percentage so you take x/100 and 12/15 then you take 12 times 100 and that gives you 1200 then you divide by 15 and get 80. So that means the answer is 80%