Question

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Answer 1

Since the two sides are the same on both and the third differs you know that the angle (2x-12)<36.
You also know it is greater than 0. Just solve for x.

Answer 2

Yeap so your range of values would be between 21 and ?

Answer 3

Well we know its a positive number so it cant be less than ?

Answer 4

correct :)

Answer 5

Ok so you figured out that one of the numbers is 21 and the other number was 0. The last step is to put it into brackets. We know that the angle can never reach 0, we also know the angle can never reach 21. So how would you display that?

Answer 6

Here check this page it explains displaying interval notation: http://www.regentsprep.org/Regents/math/ALGEBRA/AP1/IntervalNot.htm