Please I need help in this quizz I need to pass this class

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

If the cost to mail a package is an initial $5 and $0.28 for every pound the total cost to mail a package was $11.27, how much did the package weigh?

Find the distance from the theater to the library. leave your answer in simplest radical form if necessary. 12 √12 74 √74