How do I do the power rule I don't understand

A computer and printer cost a total of $939. The cost of the computer is two times the cost of a printer. Find the cost of each item?

A solid metal cube of side 3 inches is placed in a rectangular tank whos length, width, and height are 3, 4 and 5 inches, respectively. what is the volume, in cubic inches, of water that the tank can now hold.

Substract mentally by breaking apart 82-47

Kevin had $15 with him. His mother gave him $10 and his father also gave him some money. After this, he had a total of $37 with him.

Al earns $500 a week selling shoes. He also earns 8% commission on all of his shoe sales. Last week, he sold $1,540 worth of shoes. How much money did Al earn last week?

A car moving at an initial velocity of 20 meters/second accelerates at the rate of 1.5 meters/second^2 for 4 seconds. What is the final velocity?

A car manufacturer sold about 332,000 cars last year. The number of cars sold this year is 125% of the cars sold last year. About how many cars were sold this year sold this

4.2 times 7.5 with explanation

Which of the following is false? A triangle can be drawn with exactly one right angle. A triangle can be drawn with more than one acute angle. A triangle can be drawn with exactly one acute angle.

Laini uses 1-inch cubes to builb the box shown below. what is the volume