Pls help me answer the question attached

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

Drag each equation to the correct location on the table. for each equation, determine the number of solutions and place on the appropriate field in the table.

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25