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3 years ago

Which counterexample shows that the conjecture "All animals that can fly are birds" is false?

2 answers:

8 0

B would be incorrect as it is not a counterexample to the claim. C would be incorrect as a chipmunk is not a bird. And D would be incorrect as the claim says "All animals that can fly are birds" it doesn't say "every bird" or "all birds can fly"
So A is the logical choice and according to what Jimthompson5910 said "bats are one animal where they can fly but they aren't birds."

QveST [7]3 years ago

3 0

It seems like you forgot to post the answer choices. However, bats are one animal where they can fly but they aren't birds. So this is one counter-example to prove the claim false. Another example would be any flying insects.

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V+8w=4v,for v<br><br> -m+5n=-2, for n

jok3333 [9.3K]

Answer:

v = 8w/3,
n = (m - 2)/5.

---------------------------

<h3>Given equations</h3>

v + 8w = 4v and - m + 5n = - 2

<h3>Solve the first equation for v</h3>

v + 8w = 4v
4v - v = 8w
3v = 8w
v = 8w/3

<h3>Solve the second equation for n</h3>

- m + 5n = - 2
5n = m - 2
n = (m - 2)/5

6 0

1 year ago

Read 2 more answers

caleb and emily are standing 100 yards from each other. caleb looks up at a 45 degree angle to see a hot air balloon. Emily look

Sunny_sXe [5.5K]

Check the picture below.

thus then

$\bf \begin{cases}
y=100-a\\
y=a\sqrt{3}
\end{cases}\implies 100-a=a\sqrt{3}\implies 100=a+a\sqrt{3}
\\\\\\
100=a(1+\sqrt{3})\implies \boxed{\cfrac{100}{1+\sqrt{3}}=a}
\\\\\\
\textit{what is the altitude \underline{y} then?}\qquad y=100-a
\\\\\\
y=100-\cfrac{100}{1+\sqrt{3}}\implies y\approx 63.39745962156~yards$

8 0

3 years ago

Read 2 more answers

A book club offers a choice of 8 books from a list of 40. In how many can a member make a collection?

egoroff_w [7]

You have to divide 40 by 8
40/8=5

8 0

3 years ago

If a box has a length of 12 inches, a width of 10 inches and a height of 6 inches, what is the surface area?

Scrat [10]

Answer:

The answer is 28.

Step-by-step explanation:

Add all of them.

(L/ length) 12.

(W/ width) 10

(H/ height) 6

12 + 10 + 6 = 28

I hope this helps

6 0

3 years ago

Read 2 more answers

Can you solve the inequality 2(x-3) is less than or equal to 10 without using the distributive property? Explain.

STatiana [176]

Answer:

Yes, without using the distributive property, we get the value for the given expression 2(x - 3) ≤ 10 as x ≤ 8

Step-by-step explanation:

Here, the given expression is:

2(x - 3) ≤ 10

Yes, the given expression can be solved without using the DISTRIBUTIVE Property

Here, consider the given expression:

2(x - 3) ≤ 10

Now, divide the inequality by 2 on both sides, we get:

$\frac{2(x-3)}{2} \leq \frac{10}{2}\\\implies (x - 3) \leq 5$

Now adding (+3) on both the sides, we get:

(x - 3) ≤ 5 ⇒ (x - 3 + 3 ) ≤ 5 + 3

or, x ≤ 8

Hence, without using the distributive property, we get the value of x ≤ 8 for the given expression 2(x - 3) ≤ 10

6 0

3 years ago