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Salsk061 [2.6K]
3 years ago
8

How do you solve this ? Plz help

Mathematics
1 answer:
Stella [2.4K]3 years ago
6 0
Y=-2x-4 will be your answer
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Problem 5.A miner is trapped inside a mine and has access to 3 doors. The first door leads to a tunneland can take him to safety
Likurg_2 [28]

Answer:

Expected time is 15 hours for him to get to safety.

Step-by-step explanation:

We define X as the time that this miner would get to safety.

We define Y as the door he chooses initially.

P(Y= 1) = P(Y=2)=P(Y=3) = 1/3

We have E[X|Y=1] = 3

E[X|Y] = 5 hours + E[X}

E[X|Y] = 7 hours + E[X]

Then we have

E[X] = 1/3(3 + 5 + E[X] + 7 + E[X])

We cross multiply

3*E[X] = (15 + 2E[x])

3E[X] - 2E[X] = 15

E[X] = 15

So the time it would take to get him to safety is 15 hours

5 0
3 years ago
If fence poists are to be placed in a row 7 feet apart, how many posts are needed for 210 feet of fence?
ollegr [7]

Answer:

31

Step-by-step explanation:

210 ft ÷ 7 ft = 30

There are 30 7-ft lengths of fence.

Think of putting a post at the end of each 7-ft length. That means you need 30 posts. Now you must add 1 post for the beginning.

Answer: 31

8 0
2 years ago
What is the volume of a rectangular prism 8 inches long, 3 inches wide,and 5 inches high?
Nitella [24]

Answer:

V=whl=3·5·8=120

Step-by-step explanation:

Just use l x w x h and there you go.

3 0
2 years ago
What is the scale factor of the two triangles below?
vodka [1.7K]
Answer:

3/4

Explanation:

15 is 3/4 of 20
3 is 3/4 of 4
6 is 3/4 of 8
6 0
3 years ago
Write the solutions for the equation 3x+y=180°
Nadusha1986 [10]
180/3x then you get you answer 

4 0
3 years ago
Read 2 more answers
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