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NikAS [45]
4 years ago
5

Xian plans to run 14 laps around a track. Each lap is 400 yards. So far Xian has run 1,680 yards around the track. What percenta

ge of the run has Xian completed?
Mathematics
1 answer:
kenny6666 [7]4 years ago
3 0

Answer:

14 *400 is 5600 goal

1680/5600 is .3 or 30%

Step-by-step explanation:

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A health study tracked a group of person for five years. At the beginning of the study, 20% were classified as heavy smokers, 30
Aleks04 [339]

Answer: 0.421

Step-by-step explanation:

Heavy smoker = 20%

Light smoker = 30%

Non smokers = 50%

We can assume that the probability that a non-smoker is going to die in the next 5 years be y.

Since light smokers were twice as likely as nonsmokers to die during the five-year study, the probability will be:

= 2 × y = 2y

Probability for the Heavy smokers will be:= 2 × 2y = 4y

The expected number of people that will die for each in the next 5 years will be:

Non smoker:

= 50% × y

= 0.5 × y

= 0.5y

Light smoker:

= 30% × 2y

= 0.3 × 2y.

= 0.6y

Heavy smoker:

= 20% × 4y.

= 0.2 × 4y

= 0.8y

Total = 0.5y + 0.6y + 0.8y = 1.9y

The probability that the participant was a heavy smoker will be:

= 0.8y/1.9y

= 0.421

3 0
3 years ago
Why can 2 obtuse angles make a right triangle please help
djverab [1.8K]
They can NOT.  A right angle is 90°.  An obtuse angle is greater than 90°.  All the angles in a triangle must add up to exactly 180°.  If two angles are greater than 90° then they will add up to greater than 180, beacuse 90 plus 90 equals 180.  You cannot have a triangle with two obtuse angles because they will add up to greater than 180°.
8 0
4 years ago
What is the algebraic expression of one fourth of a number n?
dybincka [34]
1/4n I think I hope this is correct
5 0
3 years ago
25 points please help me
GuDViN [60]

Answer:

I can help you with C and I tis non-linear because to make it linear it needs to be a straight line and shouldn't have any curves.

Step-by-step explanation:

5 0
3 years ago
A bicycle was on sale for 32% off the original price. it is known that the sale price was $867. what was the original price?
Tcecarenko [31]

Answer:

7896

Step-by-step explanation:

5 0
3 years ago
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