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2 years ago

How does this one work?

Mathematics

1 answer:

Drupady [299]2 years ago

8 0

Answer:

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Step-by-step explanation:

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Which Method Should You use?<br> x^2+10x+4=0

lyudmila [28]

x^2 + 10x + 4 = 0

you can use the quadratic formula to solve:

a = 1, b = 10, c = 4

x= −b ± √b^2 −4ac / 2a

x = -10 ± √(10)2 − 4(1)(4) / 2(1)

x = -10 ± √84 / 2

x = -0.42 or -9.58

4 0

3 years ago

What is the average of 1/2 and 1/3

nadya68 [22]

Hi there!

In order to fin the average, you need to add all the terms together and then divide the result by the number of terms :

( $\frac{1}{2} + \frac{1}{3}$ ) ÷ 2 = average

Now, I’m assuming that you know that in order to add fractions, both fractions must have the same denominator (bottom number in a fraction). Since these fractions do not have the same denominator, we must give them one.

To find the lowest common denominator (which will help us solve this problem), we must find out what 2 & 3 go into. Well, both numbers go into 6!

So, if the denominator is now 6, you must multiply the numerator (numbers about the “/” line in this case are both 1) by how much you multiplied its denominator by.

For 1/2, you multiplied 2 by 3 to get 6. Therefore, you must multiply the 1 by 3 aswell.

for 1/3, you multiplied 3 by 2 to get 6. Therefore, you must multiply the 1 by 2.

and now you have 3/6+2/6 since the denominators are the same, you can add the numerators normally which gives you 5/6

$\frac{5}{6}$ ÷ 2 = $\frac{5}{12}$

Your answer is : $\frac{5}{12}$

There you go! I really hope this helped, if there's anything just let me know! :)

3 0

3 years ago

-8x + 40 greater than -16

Alex73 [517]

Answer:

x > 7

Step-by-step explanation:

First, you start off with :

-8x + 40 > -16

Then you subtract 40 on both sides.

You get -8x > -56.

Next, you divide -8 on both sides. Cancel out the -8/-8.

After dividing, you have x > 7

Therefore the answer is x > 7!

If you have a question comment it.

4 0

3 years ago

Read 2 more answers

From a population of 200 elements, the standard deviation is known to be 14. A sample of 49 elements is selected. It is determin

jeka94

Answer:

a. 2

Step-by-step explanation:

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean $\mu$ and standard deviation $\sigma$ , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean $\mu$ and standard deviation $s = \frac{\sigma}{\sqrt{n}}$ .

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean $\mu = p$ and standard deviation $s = \sqrt{\frac{p(1-p)}{n}}$