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3 years ago

NEED ANSWERS ASAP PLEASE

Mathematics

2 answers:

WITCHER [35]3 years ago

4 0

Answer:

the first one is 4 and 5

Step-by-step explanation:

the second one is 45 because 15+15+15 is 45, you get 15 by the square root of 225

fredd [130]3 years ago

3 0

Answer:

1)4)5

2)45

Step-by-step explanation:

1) ✓22 = 4.69041575 which is between 4 and 5

2) The area is 225ft2 area= length * length (the only one that fits here with 225 is 15) 15*15 is 225. Now that we know the sides for perimeter:

_15__

15 |. |. 15

-------

The question though, asks for the perimeter which is around. So you add 15 three times for the three sides and get 45ft

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A population has a standard deviation of 80. A random sample of 400 items from this population is selected. The sample mean is d

Helga [31]

Answer:

$ME= 1.8808 * \frac{80}{\sqrt{400}} =7.5232$

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".

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma =80$ represent the population standard deviation

n=400 represent the sample size

Solution to the problem

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

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

Since the Confidence is 0.94 or 94%, the value of $\alpha=0.06$ and $\alpha/2 =0.03$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.03,0,1)".And we see that $z_{\alpha/2}=1.8808$

The margin of error is given by:

$ME= 1.8808 * \frac{80}{\sqrt{400}} =7.5232$

4 0

4 years ago

Factor each polynomial completely. b) 5x6 - 25x5 + 30x4 +

Romashka-Z-Leto [24]

Answer:

10x+5

Step-by-step explanation:

You add or subtract 5x by -25x by 30x to get 10x. However, then you add 6-5+4 which is 5.

8 0

3 years ago

Read 2 more answers

Look at the attached image. I have no idea what to do.

mario62 [17]

Answer:

(X+3)(x+2)(x-1)(x-30)

Step-by-step explanation:

Haven’t done this in a while so I may be incorrect but that’s factored form

6 0

3 years ago

You have $6000 with which to build a rectangular enclosure with fencing. The fencing material costs $30 per meter. You also want

Roman55 [17]

Refer to the figure shown below.
x = the width of the rectangle (meters)
y = the height of the rectangle (meters(

The fencing for the perimeter of the rectangle costs $30 per meter.
The two inner partitions cost $25 per meter.

The total cost of the fencing is
C = 2(x+y)*$30 + 2y*$25
= 60(x+y) + 50y
= 60x + 110y

Because the amount available to spend is $600, therefore
60x + 110y = 6000
or
6x + 11y = 600
That is,
y = (600 - 6x)/11 (1)

The area is
A = x*y (2)

Substitute (1) into (2).
A = (x/11)*(600 - 6x) = (1/11)*(600x - 6x²)

To maximize A, the derivative of A with respect to x is zero.
That is,
600 - 12x = 0
x = 600/12 = 50
From (1), obtain
y = (1/11)*(600 - 6*50) = 300/11 = 27.273

Because the second derivative of A with respect to x is negative, x=50, y = 27.273 will yield the maximum area.

The maximum area is
50*27.273 = 1363.64 m² = 1364 m² (nearest integer)

Answer: 1364 m² (nearest integer)

5 0

3 years ago

Evaluate the sum of the finite geometric series 3 + 6 + 12 + 24 + 48 + . . . + 768

Wittaler [7]

3 + 6 + 12 + 24 + 48 + . . . + 768
= 1533

3 0

4 years ago