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3 years ago

If n(A)=80,and n(B)=65,what is the least value of n(AuB)=? please help me friends

Mathematics

1 answer:

asambeis [7]3 years ago

5 0

Answer:

Step-by-step explanation:

n(AUB)=n(A)+n(B)-n(A∩B)

greatest intersection of (A∩B)=65

n(A∪B)=80+65-65=80

so least value of n(A∪B)=80

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Write a function rule for the statements

WINSTONCH [101]

Step-by-step explanation:

x. | y

1 | -4

2 | 0

3 | 4

Is this correct?

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2 years ago

Read 2 more answers

Bab needs help with Algebra two homework. show work please! Also I'll give brainliest!

Alekssandra [29.7K]

Answer:

1. The y values are decreasing by 16 7 and 4 then rising by 7 and 16 so the line of symmetry is at -4 or 4

2. f = g(x) function just like g = f(x) function so say f value table or g(x) function

3. y = g(x) = -4 when x = 0

4. y - 0 = - 4x means the same as y = -4x

5. [0 , -4] is the vertex

6. 6(5) = 30

7 the y values are increasing by 3/4 , 11/5, 1, 7/1 and 8.5 / 1

which means thy are increasing minimum by 1/1.5 and could be a square function.

8. This is a g function or a f(x).

9. y intercept is 1

10 common ratio is 0:1

11 equation for the table is y = x -1

12. 5.400

13.

The values for y are decreasing by 2 then drop by 12 from -2/14 to 0/-2 then increase again at a rate of 20 and decrease slightly to 18 being -2/-20

we can see this as -2/16 ,-2/14 , 0/-2 2/ -22 meaning the line of symmetry is not clear as we cannot see an average without working out the mean or adding all the totals up.

14. p(x) function or q value.

15. the y intercept is -2

16. the equation for this table is y = x-2

17.

The value for p(4) is same method divide smaller into larger then times x 4

-20/-2 = 10

then -11 x 10 = -110

18. slope = -2

17) if they were asking for value for 4(p) is 16/ -2 = 8 and -2 / 4 = 0.5/ 8 this shows 8 so 4 is half this value = 0.24 / 4 meaning x = 0.24

Step-by-step explanation:

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2 years ago

Solve the problem. 8^4x = 135

kirill [66]

8^4x=135
log(8^4x)=log(135
4x*(log(8))=log(135)
4x=log(135)/log(8)
4x=2.358939
4x/4=2.358939/4
x=0.589735

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3 years ago

An SRS of 350 high school seniors gained an average of x¯=21 points in their second attempt at the SAT Mathematics exam. Assume

Lynna [10]

Answer:

a) $21-2.58\frac{52}{\sqrt{350}}=13.83$

$21+2.58\frac{52}{\sqrt{350}}=28.17$

So on this case the 99% confidence interval would be given by (13.83;28.17)

b) $ME=2.58\frac{52}{\sqrt{350}}=7.17$

c) $ME=2.58\frac{52}{\sqrt{100}}=13.42$

d) D. Decreasing the sample size increases the margin of error, provided the confidence level and population standard deviation remain the same.

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Part a

$\bar X=21$ represent the sample mean

$\mu$ population mean (variable of interest)

$\sigma=52$ represent the population standard deviation

n=350 represent the sample size

99% confidence interval

The confidence interval for the mean is given by the following formula:

$\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

Since the Confidence is 0.99 or 99%, the value of $\alpha=0.01$ and $\alpha/2 =0.005$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.005,0,1)".And we see that $z_{\alpha/2}=2.58$

Now we have everything in order to replace into formula (1):

$21-2.58\frac{52}{\sqrt{350}}=13.83$

$21+2.58\frac{52}{\sqrt{350}}=28.17$

So on this case the 99% confidence interval would be given by (13.83;28.17)

Part b

The margin of error is given by:

$ME=2.58\frac{52}{\sqrt{350}}=7.17$

Part c

The margin of error is given by:

$ME=2.58\frac{52}{\sqrt{100}}=13.42$

Part d

As we can see when we reduce the sample size we increase the margin of error so the best option for this case is:

D. Decreasing the sample size increases the margin of error, provided the confidence level and population standard deviation remain the same.

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2 years ago

If y = 2x 3, find the value of y when x=-3

Ivenika [448]

Y = 2x³, when x = -3

<span>y = 2*(-3)³
</span>
<span>y = 2*-27
</span>
y = -54

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3 years ago