Exponents and Scientific Notation

One sheet of $${8 {1\over2}}$$  " by $${11}$$ " paper weighs $${4.5\times10^{-3}}$$ kg. A school is expecting a delivery of $${100}$$ cases of paper which include a total of $${5\times10^5}$$ pieces of paper. How much does all the paper in the cases weigh? 

Light travels at a speed of approximately $${300,000,000}$$ meters per second. If the sun is approximately $${1.5\times10^{11}}$$ meters from Earth, how long, in seconds, does it take for sunlight to reach Earth? How long is this in minutes?

A student multiplied two numbers in an online scientific calculator and got the following result:

What does the answer in the calculator mean? 

What are possible factors that the student entered into the calculator?

Calculate. Write your answer in scientific notation and standard form.

$${{6.6\times10^7\over{1.1\times10^{-1}}}\cdot {3\times10^{-5}}}$$

Grizzly bears hibernate for up to 220 days per year. While they hibernate, Grizzly bears don’t eat. During the rest of the year, Grizzly bears eat up to $$5.8 × 10^4$$ calories per day.
What is the total number of calories a Grizzly bear eats in a year? Write your answer in decimal notation, scientific notation, and in words.