Answer:
a) Suppose that F is ordered in ascending order: 
. Then, the complement of F can be written as
which is the union of a finite number of open intervals, then 
is an open set. Thus, F is a closed subset of the real numbers.
b) Take an arbitrary element of F, let us say 
. Now, choose a real number 
such that
there are not other element of F, because is less that the minimum distance between and its neighbors.
In case that 
we only consider 
, and if 
we only consider 
.
Then, all points of F are isolated.
Step-by-step explanation:
30% off $ 45
<span>30% of $ 45 = (.3) (45) = $ 13.50 </span>
<span>30% off $ 45 = $ 45.00 - $ 13.50 = $ 31.50
hope this helped:)
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He has 12 marbles.
There you go
Answer:
6 km
Step-by-step explanation:
You use Pythagoras
Answer:
this is what I got
Step-by-step explanation:
