How many terms are in this expression 9a + 6b + 3c + 1

How many ordered pairs of positive integers satisfy xy=32?

Which of the following constants can be added to x2 - 3x to form a perfect square trinomial?

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