Answer:
5
Step-by-step explanation:
We can see a pattern of 1/2 as the week progresses. 1/2 of 80 is 40, 1/2 of 40 is 20, 1/2 of 20 is 10, so for the fourth week 1/2 of 10 is 5.
When a line is bisected, the line is divided into equal halves.
See below for the proof of 
The given parameters are:
- <em>AC bisects CD</em>
- <em>IJ bisects CE</em>
- <em>BH bisects ED</em>
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By definition of segment bisection, we have:
By definition of congruent segments, the above congruence equations become:
By segment addition postulate, we have:
Substitute
in 

Substitute
and 

Simplify

Apply division property of equality

By definition of congruent segments

Read more about proofs of congruent segments at:
brainly.com/question/11494126
Answer is C.
The sample is selected at tandon from the population, but it was done on a particular day of the week. So the sample is not random.
More data should be taken, distributed on every day of the week, probably in different months.
Answer:
perimeter= p1+p2 +p3+p4=add all sides.
area =l×b=
(10m×14m)= 140m