Questions on rigid motion​

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)

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)