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ElenaW [278]
3 years ago
8

Matthew and Kobie both want to do a survey to determine how many people in their community might have the Corona 19 Virus. Which

one of the methods A-D would be the best sample method for their survey to draw a valid inference?
Your answer:

Children in his community ages 6-10


Children in his community ages 3-5


Adults and Children in the community ages 25-45


Adults and Children in his community of all ages
Mathematics
2 answers:
AlekseyPX3 years ago
6 0
There all the same age
Cuz I just know
Elza [17]3 years ago
5 0
Adults and children of all ages! In order to find the most accurate results, you need a larger sample space :)
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Amelia is training for a triathlon. She swims 3/5 mile. Then she runs about 6 times farther than she swims. About how far does A
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so if amelia swims 3/5 then runs 6 times that fraction you put 6/1 and you times 3times 6 and 5 times 1 sp that equals 18/5

Step-by-step explanation:


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4 years ago
A and B working together can do a work in 6 days. If A takes 5 days less than B to finish the work, in how many days B alone can
svetlana [45]

Answer:

15 days

Step-by-step explanation:

Let x be the number of days needed for B to complete the job. Then x-5 is the number of days needed for A to complete the job.

In 1 day,

  • A completes \dfrac{1}{x-5} of all work;
  • B completes \dfrac{1}{x} of all work.

Hence, in 1 day both A and B complete \dfrac{1}{x-5}+\dfrac{1}{x} of all work. A and B working together can do a work in 6 days. Then

6\cdot \left(\dfrac{1}{x-5}+\dfrac{1}{x}\right)=1.

Solve this equation:

\dfrac{6x+6x-30}{x(x-5)}=1,\\ \\12x-30=x^2-5x,\\ \\x^2-17x+30=0,\\ \\D=(-17)^2-4\cdot 30=289-120=169=13^2,\\ \\x_{1,2}=\dfrac{17\pm 13}{2}=2,\ 15.

If x=2, then x-5=-3 that is impossible. So, B needs 15 days to complete the work alone.

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