Four points, a(0, 0), b(1, 2), c(3, 1), and d(2,-1) lie in a plane. line ad and line bc are best described as ? ?
a) skew.
b) parallel.
c) vertical.
d) concurrent.

They are best described as parallel because if you connect points AD and then connect points BC, you will get 2 lines that are parallel to each other.

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!

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