Izzo’s pizza sells four types of pizza crust. last week the owner tracked the number sold of each type. based on this information, of the next 1500 pizzas she sells, how many should she expect to be thick crust?

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