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just olya [345]
3 years ago
6

Determine what type of observational study is described. Explain. Vitamin D is important for the metabolism of calcium and expos

ure to sunshine is an important source of vitamin D. A researcher wanted to determine whether osteoperosis was associated with a lack of exposure to sunshine. He selected a sample of 250 women with opteoperosis and an equal number of women without osteoperosis. The two groups were matched in other words they were similar in terms of age, diet, occupation, and exercise levels. Histories on exposure to sunshine over the previous twenty years were obtained for all women. The total number of hours that each woman had been exposed to sunshine in the previous twenty years was estimated. The amount of exposure to sunshine was compared for the two groups. a.cohort; Individuals are observed over a long period of time. b.cross-sectional; Information is collected at a specific point in time. c.retrospective; Individuals are asked to look back in time Question 15 4 pts
Mathematics
1 answer:
ICE Princess25 [194]3 years ago
3 0

Answer:

thats too long to read but good luck!

Step-by-step explanation:

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Please help and show work!!
serious [3.7K]

17.

x = -2 is not a solution of -1 < x < 5 because -2 < -1 (-1 < -2 < 5 FALSE).

18.

m = 5 is a solution of 5 ≤ m because 5 ≤ 5 ( 5 ≤ m → m ≥ 5 greater than 5 or equal 5, 5 is equal 5)

19.

k = 10 is not solution of 2k - 3 < 1 because:

put the value of k to the inequality:

2(10) - 3 < 1

20 - 3 < 1

17 < 1 FALSE

5 0
3 years ago
54 meters in 2.5 hours
Orlov [11]
21.6 meters per hour
Solve by dividing 54 by 2.5
8 0
3 years ago
If you know that 4 of an item costs a certain amount, and you want to find out how much one costs, which operation will you use?
Natalija [7]

Answer:

The answer would be division (B)

Step-by-step explanation:

4x equals the total amount

x equals the cost of one item

Therefore you'd divide total cost by 4 and that would find the cost of one item

6 0
3 years ago
Read 2 more answers
-How mathematics helps in civil aviation?​
Arturiano [62]

Answer: to know how to do bussiness

Step-by-step explanation:civil aviation has a lot of departments they dont work only in the air but they also work at the airport. they need math to do bussıness

7 0
4 years ago
Please help ill mark brainliest!!!
Bingel [31]

Triangle QST  is similar to triangle PQR

We are given that measure of angle SRP is 90°

Q is the point of the hypotenuse SP

Segment QR is perpendicular to PS and T is a point outside the triangle on the left of s

We need to find which triangle is similar to triangle PQR

So,

Using Angle - Angle - Angle Criterion We can say that

m∠PQR = m∠SQR  (AAA similarity)

m∠SQR=m∠SQT (AAA similarity)

Where m∠Q =90°  in ΔQST and PQR

Therefore ΔQST is similar to ΔPQR

Learn more about similarity of triangles here

brainly.com/question/24184322

#SPJ4

8 0
2 years ago
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