Please explain timed

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)

Which of the following statements would be sufficient to prove that parallelograms pqrs is a rectangle ?

What is the scale factor of two similar pyramids with volumes of 64 cubic feet and 8 cubic feet