How many marbles do you need to balance the scale?

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

Determine if the equation defines y as a function of x: 2xy = 1. yes o no

The center on a target has a diameter of 5 inches. the whole target has a diameter of 25 inches. complete the explanation for what part of the whole target is the center. the center of the target takes up % of the whole target.