Answer:
72
Step-by-step explanation:
20+20+16+16=72, when they give you half of the sides, the sides opposite of it is the same.
For perimeter, just add all the sides together, if the side matches the side in front of it, make that side the same number. and then add. <span />
0.19579831 (that's what my math app said the estimate was)
The nearest whole number rounds to 6
The nearest tenth rounds to 5.70
The nearest hundredth rounds to 5.70
First, you are going to want to get the terms to the same power of 10 in scientific notation. Realize that 
. Essentially, we have converted the 
to a term with 
. Now, we can subtract the values in each term that are not 10 as shown below:
Remember that we have to turn it back to scientific notation once we are done!
Our answer is the second choice, 
. (This is the closest answer to 
.)
