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How to find the exponential function y=ca^x, with points (1,2) and (2,1)

The vertices of a triangle are a(7.5), b(4,2), and c19. 2). what is

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given