Scientific notation word problems

The table shown below gives the approximate number of pieces of mail handled by the United States Postal Service for different years.

Each page of a top-secret report on aliens requires 2 KB of space in digital format.

What is the maximum number of pages the report can have so that it can be completely stored on a USB drive that holds 4⋅10^ 6 KB?

Write your answer in scientific notation, and round to one decimal place.

….. pages

A boy band has released two albums. Their first album sold 5.9⋅10^ 5 copies. Their second album sold 1.3⋅01^ 6 copies.

How many total copies has this boy band sold?
Express your answer in scientific notation.

….. copies

The annual expenditure of the US federal government is approximately 4 trillion dollars.

If a one dollar bill is 0.0001 meters thick, how many meters tall would a stack of 4 trillion one dollar bills be?

Write your answer in scientific notation.

For reference:
11 trillion = 10^ {12}

….. meters

How many more students were enrolled at the University of Michigan in 19500 than in 1900?

Express your answer in scientific notation.

….. students

A certain animated movie earned $1.1 ⋅ 10^ 9 in revenues at the box office. The movie lasts 9.1 ⋅ 10^ 1 minutes.

How much revenue was earned per minute of the movie?
Write your final answer in scientific notation, and round to two decimal places.

$…..?

The average human body cell is about 5.1 ⋅ 10^ {−4} cm in diameter. The diameter of a plant cell is 8 ⋅ 10^ {−3}

What is the combined diameter of the body cell and plant cell?

Express your answer in scientific notation.

….. cm

Estimates show that there are 1.4⋅10^ 8 pet fish and 9.4⋅10^ 6 pet reptiles in the United States.

How many fish and reptile pets are in the United States all together?

Express your answer in scientific notation.

….. pets

The diameter of a human hair is 9⋅10^ {−5} meters. The diameter of a spider’s silk is 3⋅10^ {−6} meters.

How much greater is the diameter of a human hair than the diameter of a spider’s silk?

Write your answer in scientific notation.

….. meters

The volume of the Atlantic Ocean is about 3.1⋅10^ {17} cubic meters. The Mississippi River has an annual flow of 6.3⋅10^ {11} cubic meters.

How many times would the annual flow of the Mississippi River fit in the Atlantic Ocean?

Write your final answer in scientific notation, and round to two decimal places.

….. times