Juan needed to have his furnace fixed. The total cost for parts was $30. 5 points The labor rate was $32 per hour. If Juan's total cost to have his furnace
fixed was $958, how many hours of labor were needed?

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