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Vikki [24]
2 years ago
5

A cellular phone network uses towers to

Mathematics
1 answer:
kirill [66]2 years ago
6 0

Answer:

Both (6,\, 0) and (8,\, 2) are inside this circular area.

(6 - 5)^{2} + (0 - 1)^{2} = 2 < 22.

(8 - 5)^{2} + (2 - 1)^{2} = 10 < 22.

Step-by-step explanation:

Equation for a circle in 2D, with center (a,\, b) and radius r:

(x - a)^{2} + (y - b)^{2} = r^{2}.

Compare this expression with the one from this question:

(x - 5)^{2} + (y - 1)^{2} = 22 = \left(\sqrt{22}\right)^{2}.

Hence: a = 5, b = 1, and r = \sqrt{22}.

Therefore, \! (5,\, 1) and \sqrt{22} would be the center and the radius of the circle (x - 5)^{2} + (y - 1)^{2} = 22.

A point is inside a circle if and only the Euclidean distance between that point and the center of that circle is smaller than the radius of the circle. That is the same as requiring that the square of the Euclidean distance between these two points to be smaller than the square of the radius of the circle.

Formula for the Euclidean distance between (x_1,\, y_1) and (x_2,\, y_2):

\displaystyle \sqrt{(x_1 - x_2)^{2} + (y_1 - y_2)^{2}}.

The square of the Euclidean distance between these two points would be:

\displaystyle (x_1 - x_2)^{2} + (y_1 - y_2)^{2}.

Calculate the square of the distance between (6,\, 0) and the center of the circle, (5,\, 1).

(6 - 5)^{2} + (0 - 1)^{2} = 2.

The square of this distance is smaller than 22, the square of the radius of this circle. Hence, the point (6,\, 0) is inside this circle.

Similarly, calculate the square of the distance between (8,\, 2) and the center of the circle, (5,\, 1).

(8 - 5)^{2} + (2 - 1)^{2} = 10.

The square of this distance is smaller than 22, the square of the radius of this circle. Hence, the point (8,\, 2) is also inside this circle.

Notice that the point (x,\, y) is on the 2D circle (x - a)^{2} + (y - b)^{2} = r^{2} if and only if x and y satisfy the equation of that circle.

On the other hand, (x,\, y) is inside this circle if and only x and y satisfy the inequality (x - a)^{2} + (y - b)^{2} < r^{2}.

Both (6,\, 0) and (8,\, 2) satisfy the inequality (x - 5)^{2} + (y - 1)^{2} < 22. Hence, both points are inside the circle (x - 5)^{2} + (y - 1)^{2} = 22.

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I need help on number 2
Nina [5.8K]

9514 1404 393

Answer:

  a. 405

  b. -2

  c. 5

  d. 43

Step-by-step explanation:

I don't like doing arithmetic any more than you do, so I let a calculator do it for me. A spreadsheet works well for this, too. The function values are shown in the attachment.

Put the function argument where the variable is and do the arithmetic.

  a. h(4) = 5·3^4 = 405

  b. d(2) = 7 -9(2 -1) = -2

  c. h(0) = 5·3^0 = 5

  d. d(-3) = 7 -9(-3 -1) = 43

7 0
2 years ago
Scores on a final exam taken by 1200 students have a bell shaped distribution with mean=72 and standard deviation=9
SVETLANKA909090 [29]

Answer:

a. 72

b. 816

c. 570

d. 30

Step-by-step explanation:

Given the graph is a bell - shaped curve. So, we understand that this is a normal distribution and that the bell - shaped curve is a symmetric curve.

Please refer the figure for a better understanding.

a. In a normal distribution, Mean = Median = Mode

Therefore, Median = Mean = 72

b. We have to know that 68% of the values are within the first standard deviation of the mean.

i.e., 68% values are between Mean $ \pm $ Standard Deviation (SD).

Scores between 63 and 81 :

Note that 72 - 9 = 63 and

72 + 9 = 81

This implies scores between 63 and 81 constitute 68% of the values, 34% each, since the curve is symmetric.

Now, Scores between 63 and 81 = $ \frac{68}{100} \times 1200 $

= 68 X 12 = 816.

That means 816 students have scored between 63 and 81.

c. We have to know that 95% of the values lie between second Standard Deviation of the mean.

i.e., 95% values are between Mean $ \pm $ 2(SD).

Note that 90 = 72 + 2(9) = 72 + 18

Also, 54 = 63 - 18.

Scores between 54 and 90 totally constitute 95% of the values. So, Scores between 72 and 90 should amount to $ \frac{95}{2} \% $ of the values.

Therefore, Scores between 72 and 90 = $ \frac{95}{2(100)} \times 1200 = \frac{95}{200} \times 1200  $

$ \implies 95 \times 12 $ = 570.

That is a total of 570 students scored between 72 and 90.

d. We have to know that 5 % of the values lie on the thirst standard Deviation of the mean.

In this case, 5 % of the values lie between below 54 and above 90.

Since, we are asked to find scores below 54. It should be 2.5% of the values.

So, Scores below 54 = $ \frac{2.5}{100} \times 1200 $

= 2.5 X 12 = 30.

That is, 30 students have scored below 54.

8 0
2 years ago
What is the solution to the equation below? Round your answer to two decimal places.
vodka [1.7K]

Answer:

x = 0.5

Step-by-step explanation:

2(2x-1)=3

2(2x)+1=3

        -1  -1

2(2x)=2        2x2=4

4x=2

4÷4 Cancels out the 4 in X

2÷4=0.5

Therefore

x = 0.5

4 0
3 years ago
Help again thank you
Anarel [89]
Rational:5,737…..
Irrational:9
7 0
2 years ago
The price of an item has been reduced by 85%. The original price was $37.
Tema [17]

Answer:  <em>Multiply the original price by the decimal form of the percent and subtract that from the original price. </em>

<em>37*0.85=31.45 </em>

<em>37-31.45=5.55 </em>

<u><em>Answer: New price is $5.55</em></u>

7 0
2 years ago
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