What is the area of a classroom with a length of 30 feet and width of 15 feet

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

Can someone check if i did this correct. it’s number 4 if you’re wondering.

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.