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never [62]
3 years ago
6

Please help with geometry

Mathematics
1 answer:
Alexandra [31]3 years ago
4 0
The way to do this is to set up a 30 degree angle in a coordinate plane in the first quadrant.  I say the first quadrant since the first quadrant goes from 0 to 90 degrees and 30 falls right in that interval.  Using the positive x-axis as the initial ray of the 30 degree angle and the terminal ray of the angle as the hypotenuse of a right triangle, if we drop a height from the end of the terminal ray to the x-axis we have formed said right triangle.  The angle at the origin is the 30 degree angle.  According to the Pythagorean triple for a 30-60-90 triangle, the side across from the 30 degree angle measures 1, which is the height of our triangle.  The side across from the 60 degree angle is square root of 3, which is the base of our triangle, and the hypotenuse is 2.  The cos identity is the ratio that utilizes the side adjacent to the reference angle over the hypotenuse, which for us is \frac{ \sqrt{3} }{2}.    That's the third choice down.  Finding an "exact" value means that they want you to NOT express your answer in decimal form. 
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inysia [295]

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6 0
3 years ago
In the United States, there has historically been a strong relationship between smoking and education, with well-educated people
Paraphin [41]

Answer:

The proportion of former smokers with a university education is (A) 0.15

The proportion of men with a high school education that are current or former smokers is (B) 0.30

The degrees of freedom for the chi-square test for this two-way table are (B) 6

Step-by-step explanation:

The first thing to note is the two way table and ensure the proper arrangement of the figures in the table (Kindly find attached a picture of how the table should look)

Now, on to the first question on the former smokers with a university education = (43+28)/459 = 71/459 = 0.15 which is option A. [This is the total sum of former smokers with college and graduate school education].

The second question on the proportion of men with a high school education that are current or former smokers = (54+31+36)/459 = 0.285 = 0.30 (approximate value) which is option B.

The third question on the degrees of freedom for the chi-square test for this two-way table can be found with the formula DF = (r-1)(c-1) where,

DF = Degree of freedom ,

r = number of rows = 3

c = number of columns = 4 [<em>Kindly note that you have to exempt the row and columns with the totals</em>]

Therefore, DF = (3-1)(4-1) =2*3 = 6 which is option B.

6 0
3 years ago
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cricket20 [7]

Answer:

it's the 3rd choice, Y= -3x

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3 years ago
What could you do to make sure this students answer is correct?
enot [183]

Answer: I say the third option

Step-by-step explanation:

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Answer:

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3 0
3 years ago
Read 2 more answers
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