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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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Solve the proportion for x
NeTakaya

Step-by-step explanation:

72/64=x/8

=> x = (72×8)/64

=> x = 9.

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5 0
3 years ago
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Un edificio proyecta una sombra de 7.5m.mientras que un arbol que mide 1.6 m de altura proyecta una sombra 1.85 M¿Cual es la alt
sattari [20]

Answer: The height of the building is 6.49 meters.

Step-by-step explanation:

This can be translated to:

"A building projects a 7.5 m shadow, while a tree with a height of 1.6 m projects a shadow of 1.85 m.

Which is the height of the building?"

We can conclude that the ratio between the projected shadow is and the actual height is constant for both objects, this means that if H is the height of the building, we need to have:

(height of the building)/(shadow of the building) = (height of the tree)/(shadow of the tree)

H/7.5m = 1.6m/1.85m

H = (1.6m/1.85m)*7.5m = 6.49m

The height of the building is 6.49 meters.

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Mashutka [201]

The number in tickets sold A)107

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What is the rule for the following sequence of numbers: 2, 7, 17, 37, ?
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The rule is "add 5, add 10, add 20" and the rule keeps doubling.

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A box of LED light bulbs was tested to see how long the light bulbs last. The standard deviation of the light bulb lifetime
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