The circumference of a circle is 23π ft. What is the area, in the square feet? Express you answer in terms of pi

This is different from the first one can someone me

Find the maximum value of p= 4x + 5y subject to the following constraints :

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