Back to basics 9 - Indexed References
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Spot the rectangle
Community Problem 500!
Decipher the number 2 - 3 keys
Decipher the number 4 - 3 keys - order [1 2 3 2 1 2 3 ......]
Cipher and Decipher the message - 3 key
Find the magnetic field around the wire
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