Can someone help me really please

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 in the this question ?

The length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?