What is the percentage change when a price of 10 pounds is decreased to 7 pounds n money

What number should be added to both sides of the equation to complete this square? x^2-10x=7

When you are making a circle graph by hand, how do you convert a number for a part into its corresponding angle measure in the circle graph? when you are making a circle graph by hand, what should you do if one of your angle measures is greater than 180°?

17 in long 1.3 ft wide and 8in high what is the volume