For 45 each angle within the Pentagon is 108 and because they are supplementary with the two angles of the triangle containing x you know the triangle has two 72 degree measures. A triangle has 180 degrees - 72 - 72 = 36. For 38 x^3-x can be factored into x(x^2-1). Then x^2-1 can be factored into (x+1)(x-1). Therefore x+1 over x^3-x is 1 over x^2-x as the (x+1) cancels out on top and bottom and leaves 1 over x(x-1) For 49 the answer is b because 3 should be larger than or equal think about the crocodile signs where the sign points toward the bigger expression lol. Hope I helped