This is the amount paid or charged for something.

cost

Step-by-step explanation:

What is the amount paid or charged for something?

If you charge someone, you ask them to pay an amount of money for something that you have sold to them or done for them. The federal funds rate is the interest rate that banks charge one another for short-term loans.

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,