91Ó°ÊÓ

Write each number in scientific notation. $$0.041$$

Convert each number to decimal form. $$1.6 \times 10^{10}$$

Multiply. Write your answer in decimal form. $$\left(3 \times 10^{-5}\right)\left(3 \times 10^{9}\right)$$

In \(2010,\) the number of Facebook users each day who changed their status to 'engaged' was \(2 \times 10^{4}\). Convert this number to decimal form.

At the start of 2012 , the US federal budget had a deficit of more than $$\$ 1.5 \times 10^{13}$$. Convert this number to decimal form.

At the end of fiscal year 2015 the gross United States federal government debt was estimated to be approximately \(\quad \$ 18,600,000,000,000 \quad(\$ 18.6\) trillion), according to the Federal Budget. The population of the United States was approximately 300,000,000 people at the end of fiscal year \(2015 .\) (a) Write the debt in scientific notation. (b) Write the population in scientific notation. (c) Find the amount of debt per person by using scientific notation to divide the debt by the population. Write the answer in scientific notation.