Write "square root of 18" in simplified radical form?

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?

How can writing phrases as algebraic expressions you solve problems?

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