What percent of 28 is 35

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)

What is the value of x when x + 7 = 21?

What are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)