I think Ju Chan means minus 15 each time so it’s just 15 times four which equals 60 meters
The answer is .037
I did this by putting it in the calculator:)
Answer:
Pic 1: 
Pic 2: 
Step-by-step explanation:
<u>Picture 1:</u>
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First, add the 2x and x together for 3x
Then add 3 to both sides of the equation
Finally, divide each side by 3.
<u>Picture 2:</u>
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First, add 7x and x together for 8x
Then, minus 20 from both sides of the equation
Finally, divide each side by 8.