Which of the following statements are true?
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Plzzz i beg u so much asap ! what is the slope of this line? enter your answer in the box.

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

Write the factored form of this trinomial 9x^2+18x-7