Please help me find the profit, also please show the work so I can understand how to answer these problems for the future thank you

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 statements regarding efg are true? check all that apply.

Solve 3x-18=2y and 5x-6y=6 by elimination show work