I need help please anyone

Evaluate the given expression if m=45 |-3m|

On a piece of paper graph f(x)=5•(0.4)^x

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)