I have a question about a triangle proof question from Philips Exeter Academy

. Let A = (0, 0), B = (8, 1), C = (5, −5), P = (0, 3), Q = (7, 7), and R = (1, 10). Prove that angles ABC and P QR have the same size.

Graph the inequality. Then write the solutions in interval notation. -2<x<1

Write it out in interval notation form, please.

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