Volume of a cylinder with a 3 inch diameter is two times the volume of a cylinder with the same height in a 1/2 inch radius what is the error

In the image, point a marks the center of the circle. which two lengths must form a ratio of 1 : 2? (options are in the images since thought they were harmful phrases)

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.

If the scale factor between two circles is 2x/5y what is the ratio of their areas?