Which of the following statements are true?

Please help..

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)

Write the expression 7x^3-28xy^2 as the product of 3 factors

Find the distance between the point (-3,-4), and (see the picture below)