Which pair of numbers is relatively prime

15 and 27
10 and 21
12 and 54
21 and 39

The owner of the plant nursery where you were tells you to fill 350 ml bottles from a 30 l from a fertilizer

Prism m and pyramid n have the same base area and the same height. cylinder p and prism q have the same height and the same base perimeter. cone z has the same base area as cylinder y, but its height is three times the height of cylinder y. the figures and have the same volume.

The area of a circle is equal to 1 dm². find the radius of the circle.