Jerry wants to buy a hockey jersey the cost of the jersey is normally $75, but it is now on sale 20% off.

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 0.000008 meters in scientific notation

20 points + brainliest answer + my mom’s chocolate chip cookie ! subtract.