Numerade

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An opinion poll contacts 1161 adults and asks ”Which political party do you think has better ideas for leading the country?” a) What are the sampling units? b) What is the population?

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Question 3 (1 point) A solution is 0.059 M in nitrous acid, HNO$_2$, and has a pH of 4.25. What is the concentration of nitrite ion? ($K_a$ of nitrous acid = $4.5 \times 10^{-4}$) Report your answer to 3 decimal places.

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At the beginning of 20202020, DDC budgeted annual production of 440 comma 000440,000 doorknobs and adopted the following standards for each doorknob: Input Cost/Doorknob Direct materials (brass) 0.3 lb. at $8/lb. $2.40 Direct manufacturing labor 1.2 hours at $20/hour 24.00 Variable manufacturing overhead $6/lb × 0.3 lb. 1.80 Fixed manufacturing overhead $14/lb. × 0.3 lb. 4.20 Standard cost per doorknob $32.40

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6. For the electrical system shown below: R V L C ?? a. Prove that the transfer function between the output voltage, $v_o$, and input voltage, $v_s$, is: $\frac{V_o(s)}{V_s(s)} = \frac{Ls + R}{RCLs^2 + Ls + R}$ b. What is the order of the resulting transfer function? c. If R = 1?, L = 1H, C = 1F, hand sketch the type of response will the system have to a unit step input? (NOTE: You may ignore any numerator dynamics. Also, it is only a sketch—the general shape must be apparent, but specific values do not need to be on the sketch. Also, you may put it into Matlab to check your answer, but the Matlab code and plot do NOT need to be submitted.) d. How will your answer in part (c) change if it were a step input of magnitude 10?

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In managing project communications, what should the project manager keep in mind? Group of answer choices The receiver is responsible for making sure communications are clear. Only the team members need to be concerned about communicating with each other. Communication skills are most important during project executing. A choice must be made about how to communicate properly.

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(1) You are to make quarterly (once in three months) instalments of €2,000 into a retirement account that earns a 4.80 percent compounded quarterly. If your first contribution will be made three months from now, how large will your retirement account be in 25 years?

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Locate any planes of symmetry in each of the following compounds. You can do this by either concisely describing the plane of symmetry or by drawing the plane of symmetry on a 3D drawing of the structure. Br Br Br Br (a) 2-Bromopentane (b) 3-Bromopentane (c) 1-Bromo-2-methylbutane (d) 2-Bromo-2-methylbutane CH$_3$ CH$_3$ CH$_3$ CH$_3$ CH$_3$ CH$_3$

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Semiconductors A, B, and C have dielectric constants of 1, 10, and 50 and effective masses of 0.2, 3, and 0.4, respectively. Upon photoexcitation, in which material would you expect electronhole pairs to delocalize over the largest distance, and why? Assume all else is identical between the materials.

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2. Write a Lewis structure for each of the following molecules and ions (You show all bonding and lone pair electrons as well as all formal charges). Use the VSEPR theory to predict the geometry, the hybridization and the approximate bond angles around each central atom. (s) OH BH2 NH N NH (t) NO2 O N\equiv C-HC-C(=O)OCH3 NH2

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Find the domain of the rational function. 1) f(x) = \frac{2x^2 - 4}{3x^2 + 6x - 45}

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mary m.