What is the term that refers to a formation occurring where younger rock covers an eroded layer?

Determine the quotient of the following expression. (15n^2-27n) / 3

Layla answer 21 of the 25 questions on his history test correctly.what decimal represents the fraction of problem he answer incorrectly.

Asandwich shop has 18 tables. each table seats up to 4 people. to find the greatest number of people that can be seated, you can solve p4 ≤ 18. which step is the best way to solve the inequality? plz asap i repeat plz