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Rzqust [24]
3 years ago
7

Bernard and Adriana grew sunflowers in their backyard. Bernard's sunflower grew 4.23 cm in one week and 8.91 cm the second week.

Adriana's sunflower grew 15.12 cm in two weeks. Round each number to the nearest tenth. About how much more did Adriana's sunflower grow than Bernard's? A. about 1.7 cm B. about 1.8 cm C. about 1.9 cm D. about 2.0 cm
Mathematics
2 answers:
d1i1m1o1n [39]3 years ago
6 0
The answer is D. 2.0 because you start with 4.23 8.91 and 15.12 when it says round each number to the nearest tenth you round every number on the page now you have: 4.2, 8.9, and 15.1t hen you add 4.2 and 8.9 and get 13.1

now all you have to do is subtract 15.1 - 13.1= 2.0 or 2 and that is why D. is the answer

hope this helps 
Marina CMI [18]3 years ago
5 0
The answer to this question is D
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7 0
2 years ago
According to the American Lung Association, 7% of the population has lung disease. Of those having lung disease, 90% are smokers
postnew [5]

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Probability that a smoker has lung disease = 0.2132

Step-by-step explanation:

Let L = event that % of population having lung disease, P(L) = 0.07

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% of population that are smokers given they are not having lung disease, P(S/L') = 0.25

We know that, conditional probability formula is given by;

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                        P(S\bigcap L) = P(S/L) * P(L)

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So,  P(S\bigcap L) = 0.063 .

Now, probability that a smoker has lung disease is given by = P(L/S)

      P(L/S) = \frac{P(S\bigcap L)}{P(S)}

P(S) = P(S/L) * P(L) + P(S/L') * P(L')

       = 0.90 * 0.07 + 0.25 * 0.93 = 0.2955

Therefore, P(L/S) = \frac{0.063}{0.2955} = 0.2132

Hence, probability that a smoker has lung disease is 0.2132 .

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