###### Asked in Needs a Topic

Needs a Topic

# What element of the National Geographic video most clearly sends a message that the flu is worrisome?

**We need you to answer this question!**

###### If you know the answer to this question, please register to join our limited beta program and start the conversation right now!

## Related Questions

###### Asked in Proofs, Colleges and Universities

### Prove AnB subset A subset AUB?

I shall answer this under the assumption that 'n' means
intersection.
Recall the definitions of intersection and union:
1) x is an element of AnB if and only if x is an element of A
and x is an element of B
2) x is an element of AUB if and only if x is an element of A or
x is an element of B
and recall that
3) X is an (improper) subset of Y if and only if every element
of X is an element of Y
Thus, if x is an element of AnB, then x is an element of A and
an element of B, so it clearly is an element A (law of
simplification in logic). This implies AnB is a subset of A. Now if
x is an element of A, it is certainly an element of A or an element
of B (law of addition in logic), and therefore x is an element of
AUB.
There are other ways of answering this based on axiomatic
approaches.

###### Asked in Algebra

### What is a relation in which each element of the first set is paired with exactly one element of the second set?

If every element of the first set is paired with exactly one
element of the second set, it is called an injective (or
one-to-one) function.
An example of such a relation is below.
Let f(x) and x be the set R (the set of all real
numbers)
f(x)= x3, clearly this maps every element of the first set, x,
to one and only one element of the second set, f(x), even though
every element of the second set is not mapped to.

###### Asked in Chemistry, Science Experiments

### Is S8 polar?

###### Asked in Soil

### Is the soil a heterogeneous mixture?

###### Asked in Physics, Chemistry, Nuclear Physics, Elements and Compounds

### Heavy radioactive elements decay to form what element?

Heavy radioactive elements (parent nuclei) decay to form
daughter products that are as varied in number as the parents. Each
heavy element has its own daughter.
To find the decay mode and end products of the radioactive decay
for a given isotope, use a Table of Nuclides. A link is provided to
the interactive chart posted by the National Nuclear Data Center at
the Brookhaven National Laboratory.
The final stable element formed by all radioactive decay
is lead (element number 82).

###### Asked in Chemistry

### How does the discovery of isotopes contradict Dalton's theory?

One of the tenets of Dalton's atomic theory was that atoms of an
element are all identical to each other. However, isotopes are
"versions" of an element that have different numbers of neutrons,
so this clearly doesn't fit into his theory. Of course, when he
proposed this theory, he didn't know about isotopes yet.

###### Asked in Sales and Customer Service

### What are three important elements of customer service?

One important element of customer service is to smile and put
the customer at ease. Another element and maybe the most important
is to always put the customer first. Do not make it seem like an
effort or hassle to help them, however unusual the request. Another
key element is good communication. Speak clearly and slowly so the
customer understands exactly what is being said.

###### Asked in Letters Notes and Memos, Business Writing

### Should most business letters have justified alignment?

There are no strict rules for indenting or justified alignment
for business letters. The important element of formatting is to
ensure that the necessary standard parts of a business letter are
included and that they follow a logical sequence. The important
element is that the recipient can clearly follow and understand the
information provided by a business letter.