The price of a laptop was marked 80 percent off because it had a cracked screen. , what is the value of x in the table above?

Me what is the value of x? showing work would be appreciated - ! : )

What is the probability of rolling a single die greater than 4

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)