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2 years ago

Please help with math problem give 5 star if do

Mathematics

2 answers:

QveST [7]2 years ago

8 0

Answer:

-15

Step-by-step explanation:

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Sunny_sXe [5.5K]2 years ago

7 0

Answer:

-15

Step-by-step explanation:

Since the dot is between -14 and -17 we know the answer must lie somewhere there.
Since there are 3 lines between them, one line is 1 number

So the number on the left of -14 will be -15

Therefore the answer is -15

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The null hypothesis and the alternate hypothesis are: H0: The frequencies are equal. H1: The frequencies are not equal. Category

OLga [1]

Answer:

Reject H0

Step-by-step explanation:

Given :

H0: The frequencies are equal. H1: The frequencies are not equal

Category f0 A 10 B 30 C 30 D 10

Total f0 = (10 + 30 + 30 + 10) = 80

Expected frequency is the same for all categories :

Expected frequency = 1/4 * 80 = 20

χ² = Σ(observed - Expected)² / Expected

χ² = (10-20)^2 / 20 + (30-20)^2 /20 + (30-20)^2 / 20 + (10-20)^2 / 20

χ² = (5 + 5 + 5 + 5) = 20

Pvalue = 0.00017

Pvalue < α

5 0

2 years ago

Dinosaur fossils are often dated by using an element other than carbon, like potassium-40, that has a longer half life (in this

Firlakuza [10]

The amount of substance left of a radioactive element of half life, $t_{\frac{1}{2}}$ after a time, t, is given by:

$N(t)=N_0\left( \frac{1}{2} \right)^ \frac{t}{t_{ \frac{1}{2} }}$

Given that <span>potassium-40 has a half life of approximately 1.25 billion years.

The number of years it will take for 0.1% of potassium-40 to remain is obtained as follows:

$0.1=100\left( \frac{1}{2} \right)^ \frac{t}{1.25}} \\ \\ \Rightarrow\left( \frac{1}{2} \right)^ \frac{t}{1.25}}=0.001 \\ \\ \Rightarrow\frac{t}{1.25}\ln\left( \frac{1}{2} \right)=\ln(0.001) \\ \\ \Rightarrow \frac{t}{1.25}= \frac{\ln(0.001)}{\ln\left( \frac{1}{2} \right)} =9.966 \\ \\ t=9.966(1.25)=12.5$

Therefore, </span><span>the maximum age of a fossil that we could date using 40k is 12.5 billion years.</span>

3 0

3 years ago

'pjgopgpofmg[fmpgmfpmgpfm

fgiga [73]

Answer:

shshhshsshshdjsjsjsjjdjsjsjd

7 0

2 years ago

7 times as much as the sum of 1/3 and 4/5

Zanzabum

Well first we want to divide 1 by 3 , which is 0.3 , Now we need to divide 4 by 5 which is 0.8 .

We have our answers but 7 needs to be added by their sum so lets put them together by adding them : 0.3 + 0.8 = 1.1.

Now lets add 7 and 1.1 all together , which is 8.1.

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I hope this helps you a lot :)

8 0

3 years ago

Read 2 more answers

How can you solve for 42 = 6×?

mezya [45]

Do you mean, what times 6 equals 42 ?
if that then it is 7
6x7=42

7 0

3 years ago

Read 2 more answers