Numerade

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Consider the following reduction half-reaction and their corresponding standard reduction potentials: $2H^+ + 2e^- \rightarrow H_2$ $E^\circ_{red} = 0.00 V$ $Ni^{2+} + 2e^- \rightarrow Ni$ $E^\circ_{red} = -0.25 V$ $Cd^{2+} + 2e^- \rightarrow Cd$ $E^\circ_{red} = -0.40 V$ Which pair of substances should react spontaneously in a redox reaction? $Ni^{2+} + Cd^{2+}$ $Ni + Cd^{2+}$ $Ni^{2+} + H^+$ $Cd + Ni$ $Cd + Ni^{2+}$

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What should I do if the volume is in mL? Group of answer choices Convert to grams Leave it in mL Convert to liters Convert to moles

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QUESTION 17 Approximately what percentage of the area under the Normal Distribution Function lies within two standard deviations from the mean? A. 79% B. 95% C. 99% D. 68%

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Countries A,B,C use technologies X,Y,Z. A and X are superior while C and Z are inferior. If A uses X while C uses Z, then the country with the highest return (slope) is _,

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Exercises with Python: 4. Evaluate the central difference $\Delta^c f(x) = \frac{f(x+h) - f(x-h)}{2h}$ for a simple function $f(x) = \sin(x)$ at $x = 1.0$. Try different values of the spacing $h$. First keep decreasing $h$ until you reach a good accuracy of, say, $10^{-4}$. Verify that the corrections are of order $O(h^2)$ by plotting the difference of the true answer and the approximation as a function of $h^2$ (it should make a straight line). Eventually keep decreasing $h$ to very small values until the results go wild. Explain why the calculation breaks for a very small $h$ (say $10^{-20}$) even though Taylor expansion suggests that smaller $h$ is better.

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The current value is 5.049752. The next value is 5.082. The final value is 1739163.29.

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Salaries for teachers in a particular state have a mean of $ 47000 and a standard deviation of $ 5300. a. If we randomly select 17 teachers from that district, can you determine the sampling distribution of the sample mean? ? If yes, what is the name of the distribution? The mean? The standard error? b. If we randomly select 62 teachers from that district, can you determine the sampling distribution of the sample mean? ? If yes, what is the name of the distribution? The mean? The standard error? c. For which sample size would I need to know that population distribution of X, teacher salaries, is normal in order to answer? ? d. Assuming a sample size of 62, what is the probability that the sampling error is within $1000. (In other words, the sample mean is within $1000 of the true mean.) e. Assuming a sample size of 62, what is the 90th percentile for the AVERAGE teacher's salary? f. Assuming that teacher's salaries are normally distributed, what is the 90th percentile for an INDIVIDUAL teacher's salary?

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Suppose that T is a linear transformation such that ([])=[-],r[i])=[8 Write T as a matrix transformation. For any e IR2, the linear transformation T is given by T()= x.

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Question 16 (1 point) Perform the row operation(s) on the given augmented matrix: aR2 = -5r1 + r2 bR3 = -3r1 + r3 cR3 = 52 + r3 1) 0 1 0 2 1 2) -3 1 0 2 1 0 3) -3 2 0 1 1 4 4) 5 9 9 2 3

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A 33kV, 50Hz, three-phase transmission line is 60km long. The resistance per phase is 0.2?/km, the inductance per phase is 0.5? /km and the shunt capacitance is negligible. The line is supplying a three-phase load of 12MVA, 33kV at 0.8 p.f. lagging. Based on the short line model, determine, (i) the line-to-line voltage, and power at the sending end (ii) efficiency of the line.

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john b.