Find the missing side of each triangle. leave your answers in simplest radical form

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)

Does the point (1, sqrt 7) lie on circle shown.

Solve for x and select the correct answer