Answer:
Communitave property
Step-by-step explanation:
Easy, use these two formulas, to find Markdown:
Markdown=Original-New
and
Markdown%=

So, plug in what you know.
Markdown= $30-$20.10
M=$9.90
Now, Markdown%
Markdown%=

M%=0.33*100
M%=33
Thus, there was a 33% markdown.
You can write real numbers like this as:
-8
(-8)
-2*3
-2^(3)
I suppose you could also write in into standard form: 8
Answer:4 ways to make a code of 4 letters. 6C4=15, 4!=24, and 15×24=360
hope i helped
Step-by-step explanation: