Answer:
A. 8x10^7 is 4000 times larger tham 2x10^4
Step-by-step explanation:
The answer for the question is x=1
To subtract vectors, you simply have to subtract correspondent coordinates.
So, if you have

the subtraction is simply

So, in your case, we have

5 pencils cost $.80. Each pencil costs $0.16
Then divide $0.16 into $0.40
This equals 2.5 pencils, you can't buy half a pencil
About 3.40 rounded to the tenths place