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2 years ago

Factorise x2 - 5x + 10

2 answers:

4 0

Factoring x^2-5x+10

The first term is, x2 its coefficient is 1 .
The middle term is, -5x its coefficient is -5 .
The last term, "the constant", is 10

Step-1 : Multiply the coefficient of the first term by the constant 1 • 10 = 10

Step-2 : Find two factors of 10 whose sum equals the coefficient of the middle term, which is -5 .

-10 + 1 = -9
-1 + 10 = 9
-5 + 2 = -3
-2 + 5 = 3

No two such factors can be found !!
*Trinomial can not be factored*

Hope this helped!

tatiyna2 years ago

3 0

This equation does not factor...

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the standard iq test is designed so that the mean is 100 and the standard deviation is 15 for the population of all adults. We w

Gnesinka [82]

Answer:

A sample of 153 is needed.

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:

$\alpha = \frac{1 - 0.9}{2} = 0.05$

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

That is z with a pvalue of $1 - 0.05 = 0.95$ , so Z = 1.645.

Now, 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.

Standard deviation is 15 for the population of all adults.

This means that $\sigma = 15$

We wish to find the sample size necessary to estimate the mean IQ score of statistics students. Suppose we want to be 90% confident that our sample mean is within 2 IQ points of the true mean.

This means that a sample of n is needed.

n is found when M = 2. So

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

$2 = 1.645\frac{15}{\sqrt{n}}$

$2\sqrt{n} = 1.645*15$

Simplifying both sides by 2

$\sqrt{n} = 1.645*7.5$

$(\sqrt{n})^2 = (1.645*7.5)^2$

$n = 152.2$

Rounding up:

A sample of 153 is needed.

6 0

3 years ago

Can someone please help me

Rzqust [24]

Answer:

the graph of the function is non-linear

the table can be represented by the equation y=4x+4

Step-by-step explanation:

non linear because 1+7=8 and then 10+2 = 12 so they have different numbers to add each time

represented by the equation because the x numbers (1,2,3,4,) all multiplied by 4 and added by 4 gives you y

any more help just ask :)

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2 years ago

Can someone please give me the right answer.

MrRa [10]

Answer:

Y=106

X=18

Step-by-step explanation:

Both sides would have 65° because of the Alternet interior angles.

180° minus the 65° gives you 115° when you solve for X and solve for Y Use the 115° as shown in the photo below

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3 years ago

Which is the minimum or maximum value of the given function? a. The function has a minimum value of -2 b. The function has a min

Alex17521 [72]

Answer:

The function f(x) is not given, I used a different function but the approach and steps is the same .

Step-by-step explanation:

Given the function f(x) = 2x2 - 8x + 5

compare with the normal quadratic equation ; ax2 + bx + c = f(x)

a = 2, b = -8 and c = +5

since a is greater than zero i.e a > o {positive}

As such, it has a minimum

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x = -(-8)/2 x 2

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zvonat [6]

Answer:

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Step-by-step explanation:

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