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3 years ago

CAN SOMEONE PLEASE HELP AND EXPLAIN THIS

Mathematics

2 answers:

lord [1]3 years ago

7 0

Answer:

what are the options? I'll say it in the comments

mr_godi [17]3 years ago

5 0

7b+76=90
7b=14
b=2
2(2)+42=46
so cbt=46
hope this helps :)

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HELP ASAP!!!!

Dahasolnce [82]

Hey again!

The answers for your question is A; Positive, and C; no association

7 0

3 years ago

5. A study found that the average time it took a person to find their dream home was 5.9 months. If a sample of

solong [7]

Answer:

The 95% confidence interval of the mean time it took a person to find their dream home is between 5.64 months and 6.16 months.

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:

$\alpha = \frac{1-0.95}{2} = 0.025$

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

So it is z with a pvalue of $1-0.025 = 0.975$ , so $z = 1.96$

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.

$M = 1.96\frac{0.8}{\sqrt{36}} = 0.26$

The lower end of the interval is the sample mean subtracted by M. So it is 5.9 - 0.26 = 5.64 months

The upper end of the interval is the sample mean added to M. So it is 5.9 + 0.26 = 6.16 months.

The 95% confidence interval of the mean time it took a person to find their dream home is between 5.64 months and 6.16 months.

4 0

4 years ago

A tire on a toy car has a diameter of 8 cm if the toy car travels 12,560 cm approximately how many times does the tire rotate? U

Marina86 [1]

Answer:

The number of rotations completed by tire = 500.

Step-by-step explanation:

The diameter of the tire of toy car = 8 cm

Now, DIAMETER = 2 x RADIUS

So, radius of the tire = D/2 = 8/2 = 4 cm

Now, Circumference of the Circle = 2πr

= 2 x 3.14 x 4 = 25.12 cm

Now, $\textrm{Total number of rotations} = \frac{\textrm{Total Area covered}}{\textrm{Area covered in 1 rotation}}$

= $\frac{12,560}{25.12} = 500$

The number of rotations completed by circle = 500.

6 0

3 years ago

gayaneshka [121]

Answer:

$M(x,y) = (4.8,4.4)$

Step-by-step explanation:

Given

$P(x_1,y_1) = (6,2)$

$Q(x_2,y_2) = (3,8)$

$m:n = PM:MQ = 3 : 2$

Required

Determine the coordinates of M

To solve this, we make use of the following partition formula:

$M(x,y) = (\frac{nx_2+mx_1}{n+m},\frac{ny_2+my_1}{n+m})$

Substitute values for m, n, x's and y's

$M(x,y) = (\frac{2*3+3*6}{2+3},\frac{2*8+3*2}{2+3})$

$M(x,y) = (\frac{24}{5},\frac{22}{5})$

$M(x,y) = (4.8,4.4)$

<em>Option D is correct</em>

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3 years ago

Whats the value of x A.5 B.2.5 C.7.5 D.10

Anna007 [38]

I think the answer is b

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3 years ago