Ms. Bohan drinks 3/5 of her drink from starbucks. What percent of her drink did she have?

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)

Can someone me out here and the tell me the greatest common factor

How is working backward similar to solving an equation?