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3 years ago

If R=5Z then 15Z=3Y, then R=? Show work please

Mathematics

1 answer:

Debora [2.8K]3 years ago

6 0

If R = 5z
Then 15 z = 3R so there given 15z=3Y soo R= 5 Y

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Which of the following is the solution to the following system of inequalities? x+2y_ 2

Contact [7]

Answer:

2y+2

Step-by-step explanation:

because x can be used in in place of missing equations

4 0

3 years ago

Nathan boards an elevator in the lobby that is headed up at 160 meters per minute. Meanwhile, 210 meters above, Joey boards an a

Vesna [10]

Let time be t , distance be d

160t=d-(1)
230t=210-d-(2)

Put value in eq(2)

$\\ \rm\longmapsto 230t=210-(160t)$

$\\ \rm\longmapsto 70t=210$

$\\ \rm\longmapsto t=30min$

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3 years ago

Which expression is equivalent to (xy)z?<br>o (x+y)+z<br>O2z(xy)<br>O x(y+z)

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Answer:

the first one

Step-by-step explanation:

7 0

3 years ago

Consider a bettering game where you bet $10 and have a probability of 0.45 of getting $20 back ($10 more than you started with)

Marina CMI [18]

Answer:

(a)

$f(x) = P(X=x) = \begin{Bmatrix} 0.45 \,\,\, \text{for} \,\,\, x = 10 \\ 0.55 \,\,\, \text{for} \,\,\, x = -10 \end{matrix}$

(b)

-1

(c)

Step-by-step explanation:

(a)

Your random variable will have two possible values, 30 and 0, one of them with a probability of 0.45 and the other one with a probability of 0.55. Therefore it looks like this.

$f(x) = P(X=x) = \begin{Bmatrix} 0.45 \,\,\, \text{for} \,\,\, x = 10 \\ 0.55 \,\,\, \text{for} \,\,\, x = -10 \end{matrix}$

(b)

The expected value of this PMF would be

$E[X] = -10*0.55+10*0.45= -1$ therefore on average you will have a dollar less.

(c)

For this one, if you play 20 times and your initial amount is 50$ then you have to compute the following expectation.

$E[50+20*X] = 50+20*E[X] = 50-20 = 30$

7 0

3 years ago

ANSWERS PLEASE (and work if needed)

zlopas [31]

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6 0

3 years ago