3 years ago

Solve for m: (7-3m) / (m^2-1) = 0

1 answer:

8 0

If m can be negative, m = -1 would be the answer. Substituting the value of m as -1 into the equation above, we get (7 - 3(-1)) = (7+3) = 10 and ((-1)^2-1)) = 1-1 = 0. Thus, 10/0 = 0.

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Can somebody help me with this math problem?

Travka [436]

Answer:

integer and rational

Step-by-step explanation:

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3 years ago

3. From the table below, find Prof. Xin expected value of lateness. (5 points) Lateness P(Lateness) On Time 4/5 1 Hour Late 1/10

wariber [46]

Answer:

The expected value of lateness $\frac{7}{20}$ hours.

Step-by-step explanation:

The probability distribution of lateness is as follows:

Lateness P (Lateness)

On Time 4/5

1 Hour Late 1/10

2 Hours Late 1/20

3 Hours Late 1/20

The formula of expected value of a random variable is:

$E(X)=\sum x\cdot P(X=x)$

Compute the expected value of lateness as follows:

$E(X)=\sum x\cdot P(X=x)$

$=(0\times \frac{4}{5})+(1\times \frac{1}{10})+(2\times \frac{1}{20})+(3\times \frac{1}{20})\\\\=0+\frac{1}{10}+\frac{1}{10}+\frac{3}{20}\\\\=\frac{2+2+3}{20}\\\\=\frac{7}{20}$