Why does the library have so many floors?

(Only doing first six because there's just too many)

Reflection over the x-axis: (x, -y)

Reflection over the y-axis: (-x, y)

Reflection over both axes: (-x,-y)

e.g. (-5,-9) over x-axis -> (-5,9), 4th letter

(2,-3) over y-axis -> (-2,-3), 9th letter

(6,4) over both axes -> (-6,-4), 17th letter

(-7,2) over both axes -> (7,-2), 12th letter

(-3.9,5) over y-axis -> (3.9,5), 1st letter

(4, 1 1/2) over x-axis -> (4, -1 1/2), 19th letter

step-by-step explanation: step 3 should really go to step seven, but anyway never mind.

1 ∠oln ≅ ∠lno

e.

step-by-step explanation:

because there are always 10 numbers in a phone number.