I believe you just have to draw 2 little lines in between AB and CD.
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1) This sequence of numbers is arithmetic, because each number is the previous one divided by two.
2) the next number in the sequence is 125/2, which is 62.5
Yes,
(0,3) = (x,y)
0 = x
3 = y
Y = x + 3
Turns into:
3 = 0 + 3
0 + 3 = 3
Hope this helps you understand! <3