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estimate a typical, ordinary least squares regression model which explains how many

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4. In an environment characterized by perfect competition, we expect that ________. A) there are very few firms in the economy B) there are many firms in the economy but a very few have the lion's share of the industry C) the are many small firms in the economy and every single firm is a price taker D) the government sets prices for all firms E) none of the above

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A series of studies on smoking in the US demonstrated that less than 20 percent of smokers were in preparation, approximately 40 percent of smokers in contemplation, and another 40 percent were in precontemplation. Question 6 options: TrueFalse

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11. A car travels due east at 22 m/s. It makes a turn over a 4 sec duration and travels due south at the same speed of 22 m/s. By subtracting the initial velocity vector ($\vec{v_i}$) from the final velocity vector ($\vec{v_f}$) by the usual vector subtraction operation, yields a change in velocity of magnitude 31.1 m/s, and direction of 45º south of west. What is the magnitude and direction of the average acceleration vector, over the 4 sec interval? Hint: average acceleration vector = $\frac{\vec{v_f} - \vec{v_i}}{\Delta t}$ A) 5.5 m/s² in direction of 45º south of east B) 5.5 m/s² in direction of 45º south of west C) 7.75 m/s² in direction of 45º south of east D) 0.00 m/s² in direction of the south E) 7.75 m/s² in direction of 45º south of west F) 44 m/s² in direction of the south east

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1. For each predator-prey system, determine which of the variables, $ x $ or $ y $, represents the prey popolation and which repre- (b) $ \frac{d x}{d r}=0.2 x-0.0002 x^{2}-0.006 x y $ sents the predator population. Is the growth of the pery restricted jost by the predators or by other factors as well? Do the predators feed only on the prey or do they have additional \[ \frac{d y}{d r}=-0.015 y+0.00008 x y \] food sourcer? Explain. (a) $ \frac{d x}{d t}=-0.05 x+0.0001 x y $ \[ \frac{d y}{d t}=0.1 y-0.005 x y \] 2. Each system of differential equations is a model for two specios that either compete for the same resources or cooperate for matual benefit (flowering plants and insect pollinators, for instance). Decide whether each system describes competition or cooperation and explain why it is a reasonable 692 CHAPTER 9 Differential Equations model (Ask yourself what effeet an increate in one species has on the growth nate of the other.) (a) $ \frac{d x}{d x}=0.12 x-0.0006 x^{2}+0.00001 x y $ \[ \frac{d y}{d t}=0.08 x+0.00004 x y \] (b) $ \frac{d x}{d y}=0.15 x-0.0002 x^{2}-0.0006 x y $ \[ \frac{d y}{d t}=0.2 y-0.00008 y^{2}-0.0002 x y \] 6.

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45. In 2009, the Ontario government began converting some of its coal-powered electricity generating stations to operate on natural gas in the hope of eliminating coal plants by 2014. a) How does the combustion of coal to generate electricity contribute to acid precipitation? (Refer to the chemical reactions involved when answering this question.) (2 marks) b) Why is using natural gas a better solution? (2 marks) c) What other environmental problem is related to the combustion of fossil fuel such as coal and natural gas? (2 marks) 5. 12.50 mL of 0.100 mol/L NaOH is needed to neutralize 50.00 mL of a nitric acid solution.

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Q3. An ideal Otto Cycle has a compression ratio of 10. At the beginning of the compression process, air is at 100 kPa and 15°C, and 600 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Use cold-air- standard assumptions ($c_p = 1.005 \frac{kJ}{kgK}, c_v = 0.718 \frac{kJ}{kgK}, k = 1.4$), determine a) the maximum temperature and pressure that occur during the cycle, b) the net-work output, c) the thermal efficiency.

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You are presented with the following three projects. Your manager has asked you to evaluate all three projects and make your recommendation. Project A Initial Cost $100,000 Annual Savings $50,000 Annual Expenses $15,000 Project life 8 years MARR 5% Project B $50,000 $30,000 $5,000 8 years 5% Project C $98,000 $40,000 $25,000 8 years 5% To view the interest factors for discrete compounding when i=5%, 10% and 15% per year respectively, check the tables in your given formula sheet or the internet.

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Please explain: 1. Two 1.00 W resistors, R1 and R2, are connected in parallel. What is the total resistance of the combination? 2. Another 1.00 W resistor, R3 = 400 Î©, is now added in parallel with R1 and R2. What is the new total resistance of the combination?

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(Dijkstra algorithm for shortest path in a diagraph) Consider the following diagraph. With the indicated link costs, use Dijkstra's algorithm to find the shortest-path a drone is required to follow from the starting point x to all points. Please, show details of all steps.

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regina c.