7.4 times4.763 pls help asap

What is the number 321,000,000 in scientific notation? also what is the number? ?

Ill mark the brainliest if you me with the these three questions 7,8,9

Val and tony get paid per project. val is paid a project fee of $44 plus $12 per hour. tony is paid a project fee of $35 plus $15 per hour. write an expression to represent how much a company will pay to hire both to work the same number of hours on a project.