If a teacher asks a student to provide more alaboration in an essay what does this mean

Which poems include the theme that memories of beautiful natural places benefit the people who recall them? "to spring" and "lines written in early spring" "to autumn" and "to a butterfly" "to summer" and "the human seasons" "i wandered lonely as a cloud" and "lines on a beautiful spring in a village"

What is the reasoning in this argument?

What is the missing statement in step 3 of the proof? given: z1 is complementary to 22. 22 is complementary to 23. prove: m_1 = m23 m21 = m2 m2 1 + m22 = 90° m22 = m23 m22 + m23 = 180° 2 statements 21 is comp. to 22 2. 22 is comp. to 23 3. ? 4. mz1 - 90°-m22 m22+m23 = 90° 6. m23 = 90°-m22 7 m21 - m23 reasons 1. given 2. given 3. def of comp. zs 4. subtr equality prop. 5. def. of comp. 25 6 subtr. equality prop 17. trans. prop. vo