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ANTONII [103]
3 years ago
8

(9/10 - 2/5)-2/5(1/2) to the second power

Mathematics
1 answer:
polet [3.4K]3 years ago
6 0
<span>(1/2) to the second power means (1/2)^2. So we need to solve.</span><span>
(9/10 - 2/5)-2/5(1/2)^2=(9/10-4/10)-2*/5*4=5/10-2/20=10/20-2/20=8/20=4/10=0.4</span>
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Help<br> Question in picture
viva [34]

Answer:

B

Step-by-step explanation:

Notice that the y intercept is 125 and that each time week it goes down by 25 meaning the slope is equal to -25

this means our equation is

-25x+125=y which is the same as b

5 0
3 years ago
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What is the first step when rewriting y = –4x2 + 2x – 7 in the form y = a(x – h)2 + k?
lubasha [3.4K]

Answer: it might be D

Step-by-step explanation: I think so on edge -4 must be factored from -4x^2-7

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4 years ago
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Which expression is equivalent to 36x2 − 100? a. 4(3x − 5)(3x − 5)
ahrayia [7]

Answer:

b. 4(3x + 5)(3x - 5)

Step-by-step explanation:

Recall difference of squares general formula as a² - b² = (a+b)(a-b)

Looking at the question we have 36x² - 100

Looking at the given answer choices we see there is some factor multiplied through the difference of squares, so we pull out the greatest common factor from the question to get 36x² - 100 = 4(9x² - 25). Now apply difference of squares where a² = 9x² and b² = 25 to get a = 3x and b = 5. Now the equation becomes b. 4(3x + 5)(3x - 5)

7 0
3 years ago
A sample with a mean of m = 40 and a variance of s2 = 20 has an estimated standard error of 1 point. how many scores are in the
tamaranim1 [39]

The correct option is 20.

The score found for the sample is 20.

<h3>What is Standard error?</h3>

A standard error is a statistic that is applied to test the distribution of data. This metric is comparable to standard deviation. We can calculate the standard error if we know the sample size & standard deviation. It assesses the mean's precision.

Now, according to the question;

Sample mean; \bar{x}=40

Sample variance; s^{2}=20

Thus, s=\sqrt{20}=4.47

Standard error SE = 1

The amount of scores with in sample must be determined here.

The standard error formula is as follows:

S E=\frac{s}{\sqrt{n}}

We might rearrange the formula as follows:

\begin{aligned}\sqrt{n} &=\frac{s}{S E} \\n &=\left(\frac{s}{S E}\right)^{2}\end{aligned}

Substituting the values;

\begin{aligned}&n=\left(\frac{4.47}{1}\right)^{2} \\&n=19.98\end{aligned}

The sample's number of scores n = 19.98 = 20 (round up)

Therefore, the scores are in the sample is 20.

To know more about the Standard error, here

brainly.com/question/14467769

#SPJ4

3 0
2 years ago
Who statement is true
mafiozo [28]

Answer:

C) f(2)=0 and g(-2)

Step-by-step explanation:

You start by looking at each graph and the given x values.

Check what value is at x=2 on the bue graph for your f(x), in this case it's 0. It's the same process for the red graph, g(x), which is 0.

3 0
3 years ago
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