Question

Help 30 minutes to turn in

Answer 1

First, you are going to want to get the terms to the same power of 10 in scientific notation. Realize that $9.3 \cdot 10^7 = 9.3 \cdot 10^6 \cdot 10^1= 93 \cdot 10^6$. Essentially, we have converted the $9.3 \cdot 10^7$ to a term with $10^6$. Now, we can subtract the values in each term that are not 10 as shown below:

$93 \cdot 10^6 - 3.14 \cdot 10^6$

$(93 - 3.14) \cdot 10^6$

$89.86 \cdot 10^6$

Remember that we have to turn it back to scientific notation once we are done!

$89.86 \cdot 10^6 = 8.986 \cdot 10^7$

Our answer is the second choice, $8.98 \cdot 10^7$. (This is the closest answer to $8.986 \cdot 10^7$.)