Numerade

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What have you learned from your peers' posts and ideas this week? How do you think you will use that new information in your own writing inside and outside the classroom moving forward?

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Consider the following two statements about adding independent variables into a regression model: ◻ Adding more independent variables into the model necessarily reduces bias. We do not necessarily have an omitted variable bias problem if the omitted variable is uncorrelated with the included variable. Only statement 2 is true. Both statements are false: Only statement 1 is true. Both statements are true,

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Part III. A. Medium of exchange (8 points) List 4 characteristics of a medium of exchange and explain why gold is often preferred as a medium of exchange. Explain each: a. b. c. d.

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Question 3 1 pts Which payment system(s) does the Ambulatory Surgery Center Payment System pay from for physician services? Only two of these Medicare Physician Fee Schedule Medicare Part A Hospital Outpatient Prospective Payment System Question 4 1 pts Which statements below are considered medically necessary by Medicare: The procedure or service is necessary All of these The procedure or service is provided at the most appropriate level that is safe and effective The procedure or service matches the diagnosis

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Which of the following would take place in the market for Gateway desktop computers if the government implemented a price ceiling of $1,900? Market for Gateway Desktops Quantity Quantity Price Supplied Demanded $2,000 72,000 40,000 $1,900 68,000 52,000 $1,800 64,000 64,000 $1,700 60,000 76,000 $1,600 56,000 88,000 $1,500 52,000 100,000 $1,400 48,000 112,000 $1,300 44,000 124,000 $1,200 40,000 136,000 A. A surplus of 4,000 computers would result. B. A shortage of 16,000 computers would occur. C. No shortage or surplus would occur because the ceiling is ineffective. D. A surplus of 16,000 computers would result.

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Jennifer was watching her little toddler, Jackson, running on the sidewalk. He then fell and skinned his knees. He looked back at his mom, saw she was smiling, got back up, and continued running. Why didn't Jackson scream out?

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Simplify the difference quotient $\frac{f(x+h) - f(x)}{h}$ for the given function. $f(x) = \frac{13}{x}$ $\frac{f(x+h) - f(x)}{h} = \boxed{}$ (Simplify your answer.)

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(8) (a) Compute the Fourier sine series for the function $f$ such that $f(x) = x^2$ on the interval $[0, 1]$. (b) Compute the solution $u(z, t)$ for the partial differential equation with $x$ in the interval $[0, 1]$ and $t > 0$: $u_t = 36u_{zz}$ with $u(0, t) = u(1, t) = 0$ for $t > 0$ $(boundary conditions)$ $u(x, 0) = x^2$ for $0 < x < 1$ $(initial conditions)$

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E2.3 As the cell membrane has both resistive and capacitive properties, it can be represented by an equivalent circuit of a resistor and capacitor in parallel (Figure 3.4 in the course book), with a resting potential calculated using the Nernst equation for the individual ionic species. The potential difference across a cell membrane from outside to inside is initially -87 mV in the resting state. When a current pulse with amplitude 20 pA is injected into the cell using a microelectrode, the cell is depolarized to a steady-state level of +23 mV, as shown in the figure below. The cells used in the experiment can be approximated to be spherical, with a diameter of 14.6 um. In the resting state, the intracellular concentration of Na* is 15.0 mM. 20 -20 (Aw) -60 -80 0 20 40 60 80 100 120 time (ms) 140 160 180 200 a) To start, calculate the membrane resistance. What is the membrane time constant based on the figure? Also, calculate the membrane capacitance. How does that compare to the theoretical total capacitance that you can calculate using the typical value of specific membrane capacitance for biological membranes? answers: Rm=55M, T=35 ms, Cm~6.4pF b) How much charge moves through the cell membrane during the depolarization? If the depolarizing current is carried by Na* ions, how many ions move to the intracellular space? How much does the number of Na* ions change inside the cell because of this? (answers: Qch = 7.0x10-11 C, N = 4.37 10 ions, Na* = 0.003%)

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P3. (25 marks) A square-thread power screw (shown in figure) has a major diameter of 36 mm and a pitch of 4 mm with double threads. Find the effective (equivalent) stress at the root of the tooth. You are given the values for the external load, F, and the raising torque, $T_x$, in the data sheet.

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christy e.