Which of the following word problems is an example of the multiplication​

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

The graph of a curve that passes the vertical line test is a:

The circle below is centered at the point (3, 1) and has a radius of length 2. what is the equation?