Which of the following diagrams is the BEST hierarchy of shapes, based on their properties?

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Acar travels at an average speed of 52 miles per hour. how long does it take to travel 299 miles

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)