If you're struggling with graphing problems, I'd highly recommend that you check out Desmos and Mathaway. All you have to do is type the equations and it graphs it for you. Here's the first question:

4 0

3 years ago

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

2 years ago

192+4(7a+6) Pls Help Show ur work (No spam)

horrorfan [7]

Answer:

192 + 4( 7a + 6 )

DISTRIBUTE

192 + 28a + 24

ADD THE NUMBERS

216 + 28a or 28a + 216

Step-by-step explanation:

U DON'T HAVE TO TYPE "DISTRIBUTE" and "ADD THE NUMBERS"

7 0

2 years ago