<PRE><B>Question 313440</B>
3x + 2x + 10 + 8x - 25 = 180

13x - 15 = 180

13x = 180 + 15

13x = 195

x = 195/13

x = 15

The three angles are: 3(15) = 45, 2(15) + 10 = 40 and 8(15) - 25 = 95

The BIG angle of 95 degrees points me to answer choice A for obtuse.

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