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2 years ago

Anyone understand this? if you know i’ll make you a brainliest.

Mathematics

1 answer:

sergeinik [125]2 years ago

6 0

Answer:3

Step-by-step explanation: 3 +5 = 8 12 x 8 = 96, 32 x 3 = 96, 96 = 96

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What is the quotient of 560 and 7?

natka813 [3]

Quotient is Latin for "how many times" and it is the answer to a division problem.

560/7=80

we can prove this by doing it backwards

7*80=560

3 0

2 years ago

two towers labeled Tower A and Tower B some distance apart and a fire image at a certain distance from both towers Towers A and

astra-53 [7]

Answer:

7.0 mi

Step-by-step explanation:

see the attached figure to better understand the problem

step 1

Find the measure of angle C

Remember that the sum of the interior angles in any triangle must be equal to 180 degrees

$A+B+C=180^o$

substitute the given values

$42^o+64^o+C=180^o\\C=180^o-106^o=74^o$

step 2

Find the measure of a

Applying the law of sines

$\frac{c}{sin(C)}=\frac{a}{sin(A)}$

substitute the given values

$\frac{10}{sin(74^o)}=\frac{a}{sin(42^o)}$

solve for a

$a=\frac{10}{sin(74^o)}sin(42^o)\\a=7.0\ mi$

8 0

2 years ago

Read 2 more answers

Use the rectangle FOUR to find the value of x.<br>in FU = 38, RQ = 2x + 9.

icang [17]

Answer:

x = 5

Explanation:

2x + 9 = 19

2x = 10

x = 5

7 0

2 years ago

The manager wanted to know the overall quality of a large batch of products. The quality management team selected a sample of 10

ElenaW [278]

Answer:

a) The 95% confidence level two-tail confidence interval for the mean value of the key index of this batch is between 98.22 and 99.78

b) The minimum sample size to achieve this is 246.

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(square root of the variance) and n is the size of the sample. So in this question, $\sigma = \sqrt{16} = 4$

$M = 1.96\frac{4}{\sqrt{100}} = 0.78$

The lower end of the interval is the sample mean subtracted by M. So it is 99 - 0.78 = 98.22

The upper end of the interval is the sample mean added to M. So it is 99 + 0.78 = 99.78.

a) The 95% confidence level two-tail confidence interval for the mean value of the key index of this batch is between 98.22 and 99.78

(b) (5 points) If we want the sampling error to be no greater than 0.5, what is the minimum sample size to achieve this based on the same confidence level with part (a)

We need a sample size of n

n is found when $M = 0.5$

Then

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

$0.5 = 1.96*\frac{4}{\sqrt{n}}$

$0.5\sqrt{n} = 4*1.96$

$\sqrt{n} = \frac{4*1.96}{0.5}$

$(\sqrt{n})^{2} = (\frac{4*1.96}{0.5})^{2}$

$n = 245.86$

Rounding up

The minimum sample size to achieve this is 246.

6 0

2 years ago

Elise built a rectangular vegetable garden that is 999 feet long and has an area of 72 square feet.

Rzqust [24]

Perimeter of a rectangle=2(long)+2(width)

1)we calculate the width.
area=long x width

data:
area =72 ft².
long=9 ft

72 ft²=9 ft * width
width=72 ft²/9 ft=8 ft.

2) we calculate the perimeter.
perimeter=2(9 ft)+2(8 ft)=18 ft + 16 ft=34 ft.

Answer: the perimeter of Elise`s vegetable garden is 34 ft.

8 0

3 years ago