Find the 20th term in the following arithmetic sequence 12 15 18 21

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

The total cost of anja’s trip to the dentist was $628.35. she paid a flat fee of $89.95 which included the checkup and cleaning and then had 4 cavities filled, each of which cost the same amount. which shows the correct equation and value of x, the cost of each cavity filling?

Find cot x if sin x cot x csc x = √2