Can someone please help

Find the nonpermissible replacement for binthis expression. b2/5b +5

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

5/4 gallons of water fill 5/6 of a bucket how many gallons of water fill the entire bucket