Enter the correct sum in each box. Use the number line to help you. (A) 4.6 + (-5.9)

(B) -4.4 + 6.2

(C) 2.1 +0.5

(D) -3.8 + (-1.3)​

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