5 less than the number k

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)

If a suspect is in possession of 20 grams of cocaine how many ounces does he possess what will the charge be

Which ordered pair is a solution of the equation? 2x+3y=10