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krek1111 [17]
3 years ago
6

For what values of x is x2 + 2x = 24 true? –6 and –4 –4 and 6 4 and –6 6 and 4

Mathematics
2 answers:
maks197457 [2]3 years ago
8 0

Answer:

c

Step-by-step explanation:

Delicious77 [7]3 years ago
6 0
The values of x must be 4 and -6.

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Please help. Evaluate this.
Alekssandra [29.7K]

Answer:

Step-by-step explanation:

i dont even know thats hard

7 0
3 years ago
It is known that the population variance equals 484. With a .95 probability, the sample size that needs to be taken if the desir
Ksju [112]

Answer:

We need a sample size of at least 75.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.025 = 0.975, so z = 1.96

Now, we find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

The standard deviation is the square root of the variance. So:

\sigma = \sqrt{484} = 22

With a .95 probability, the sample size that needs to be taken if the desired margin of error is 5 or less is

We need a sample size of at least n, in which n is found when M = 5. So

M = z*\frac{\sigma}{\sqrt{n}}

5 = 1.96*\frac{22}{\sqrt{n}}

5\sqrt{n} = 43.12

\sqrt{n} = \frac{43.12}{5}

\sqrt{n} = 8.624

(\sqrt{n})^{2} = (8.624)^{2}

n = 74.4

We need a sample size of at least 75.

6 0
3 years ago
Read 2 more answers
What is 2m + 3m² - 4m ? Please show you work. :-)
Alchen [17]
Combine like terms
2m and -4m are like terms while 3m^2 isnt. So, leave 3m^2 as it is and combine the other set. 2m-4m = (-2m). Therefore, your answer should be 3m^2 - 2m
6 0
3 years ago
Please help me please
BigorU [14]

Answer: 72

Step-by-step explanation:

7 0
3 years ago
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According to a certain central bank from 2000 to 2016 the average price of a new home in a certain region increased by ​%87 to ​
ch4aika [34]
X*1.87= 572
X=572/1.87
X=$306
6 0
3 years ago
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