What does quantities represent mean

Simplify the following: 7-3[ (n^3+8n) / (-n) + 9n^2]

The perimeter of a rectangular certificate is 28 inches. The area is 48 square inches. What are the dimensions of the certificate?

Joni has two U. S coins in her pocket. One of the coins is not a dime. If the total value of coins in her pocket is 11 cents, what are the two coins. Penny Nickel Quarter Dime

Zhen is an audiobook narrator. The table gives some completed audio lengths and the amount of time Zhen spends researching, recording, and editing the audiobook. Completed (hours) _ Working time (hours) 1 _ 6 1/2 3 1/2 _ 22 3/4 7 _ 45 1/2 10 _ 65

What is the solution of

What is the quotient of 3.33 * 10-5 and 0.06?

What numbers add to - 49 and multiply to 0

What is the best chess move to win all the time?

Is this trinomial factorable r^2-15r+56

The delivery truck for Hall's Department Store left the mall at 10:00 a. m. it was gone for 7 hours. when did it return