The wavelength of violet light is a spectrum is about 0.4 meters. which number best approximates this length as a power of 10. i really need the correct answer

What is the point-slope equation of a line with slope -5 that contains the point (6,3)

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour.what is the cyclist average rate for the round trip in miles per hour ?