There are 5 cards: 2,5,7,8,9 one of the cards is removed and the mean average of the remaining 4 cards is 6 what card was removed

How many different ways can you make change for $.50 using only nickels,dimes, and quarters?

Consider a cube that has sides of length l. now consider putting the largest sphere you can inside this cube without any point on the sphere lying outside of the cube. the volume ratio -volume of the sphere/ volume of the cube is 1. 5.2 × 10−1 2. 3.8 × 10−1 3. 1.9 4. 2.5 × 10−1 5. 3.8

Is the point (0, 8) on the x-axis or y-axis? how do you know?