Please answer correctly

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 in complete factored form. 5n_(c - 3) - n(c - 3) =

What is the name of a polygon that has four congruent sides and theses angle measures 60,120,60,120?