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QUESTION 1 Read the article: by Semenya et al. (2012) with the title, Medicinal utilization of exotic plants by Bapedi traditional healers to treat human ailments in Limpopo, South Africa, very carefully and answer the following questions. You can use any other sources to help you respond to the questions. However, if you do use other sources, make sure that you acknowledge them by means of a complete list of references at the end of this assignment. 1.1. Define the following words/phrases Alien species, biodiversity, indigenous plants. 1.1.1 Alien plant species. (2) 1.1.2 Biodiversity. (2) 1.1.3 Indigenous plants. (2) 1.2. Mention any TWO plants that are indigenous to the RSA. Please indicate the source(s) of your information, not more than TWO sources. (6) 1.3. How can the use of the exotic plants referred to in the article help the environment when used for medicinal purposes? (4) 1.4. Mention the THREE categories of exotic plants according to the article. (3) 1.5. Based on the distinction provided by the authors between naturalise plants, weeds, and invasive species, which one would you consider the most undesirable and why? (4) 1.6. Mention any TWO benefits of exotic plants to humans. (2) 1.7. Mention any THREE countries where, according to the article, exotic plants are used for traditional medicinal purposes (please do not refer to countries not mentioned in the article as you will not earn marks for this). (3)

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Data were collected on the amount spent by 64 customers for lunch at a major Houston restaurant. These data are contained in the file Houston. Based upon past studies the population standard deviation is known with $\sigma = 11$. Click on the datafile logo to reference the data. DATA file Round your answers to two decimal places. Use the critical value with three decimal places. a. At 99% confidence, what is the margin of error? $ $ b. Develop a 99% confidence interval estimate of the mean amount spent for lunch. $\to $

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The redistributive mechanics of inflation include all of the following except ? Price effects. ? Output effects. ? Wealth effects. ? Income effects.

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Why could a compressor unit be considered as a pressure system?

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In the actual exam, you will only need to submit one of the two longer questions, but for the trials, you can submit both if you wish. You should submit your answers by uploading a single PDF file for this question. The marking for the longer questions is as follows: i) You need to start with an overview of the method steps that you will use (in note / bullet point form is fine). This is worth 5 marks ii) The numerical / calculation answers are worth 15 marks overall, with partial marks given for partially-correct answers. iii) 10 marks are available for a clear explanation of the correct method. Therefore, make sure you are clear in explaining your approach, as this is worth half the marks. The question does not specifically ask you for answers to the steps along the way, as planning the analysis is part of the assessment and so guidance is limited. Question 12 This question concerns the constant beam cross section below. The thickness $t$ of the inner vertical part is given as 1.xy mm, where x and y are the last two digits of your student number. The section has a constant shear modulus $G = 30GPa$ 150 mm 3 mm 50 mm + 100 mm 2 mm 3 mm 300 mm 3 mm 2 mm 2 mm 3 mm 100 mm An anticlockwise torque of 5,000 Nm is applied to the section but no other loading. Your tasks are: a) calculate the rate of twist $\frac{d\theta}{dx}$ for the beam. b) calculate the maximum shear stress in the section and specify where this occurs.

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Problem 2. A local brewery captures and sells the excess CO$_2$ produced from their beer fermentation to a biofuel company. The biofuel company requires that the CO$_2$ be at a temperature of 27°C. In order to cool the CO$_2$, which is at a temperature of 87°C after the fermentation process, the brewery takes advantage of a crossflow shell and tube heat exchanger system. The CO$_2$ flows at a rate $\dot{n}_{CO_2} = 375 \frac{kg \ mol}{hr}$. Liquid water at 15°C, which flows through the tube side of the heat exchanger, is available as the coolant. a) What mass flow rate of water would be required if the brewery wants the exiting water to be no higher than 60°C? Take the heat capacity of water to be $C_{p,w} = 4.2 \frac{kJ}{kg \ K}$. b) A heat exchanger that uses copper tubes (of length = 10m, inner diameter = 0.3 inches and outer diameter = 0.622 inches), is available to the brewery. The flow within the pipes is considered turbulent (Re = 10,000). Calculate the overall heat transfer coefficient based on the internal ($U_i$) and the external ($U_o$) surface area of the heat exchanger. Take the heat transfer coefficient between the CO$_2$ and the outer surface of the copper tube to be $250 \frac{W}{m^2 K}$, the outlet water temperature to be 60°C and take the thermal conductivity of copper to be $386 \frac{W}{m K}$. c) How many copper tubes are required for this heat exchanger? Using the heat exchanger effectiveness charts, Find the effectiveness of the copper heat exchanger.

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Consider the following data set from a sample of college students. Use this data set to answer the questions below. Student Year Smoke Award Exercise TV Height Weight Siblings BirthOrder Piercings 1 Senior No Olympic 10 1 71 180 4 4 0 2 Sophomore Yes Academy 4 7 66 120 2 2 3 3 FirstYear No Nobel 14 5 72 208 2 1 0 4 Junior No Nobel 3 1 63 110 1 1 6 5 Sophomore No Nobel 3 3 65 150 1 1 0 6 Sophomore No Nobel 5 4 65 114 2 2 4 7 FirstYear No Olympic 10 10 66 128 1 1 12 8 Sophomore No Olympic 13 8 74 235 1 1 0 9 Junior No Nobel 3 6 61 123 2 2 8 10 FirstYear No Nobel 12 1 60 115 7 8 1 11 Sophomore No Olympic 12 6 65 140 1 2 2 12 FirstYear No Olympic 10 5 63 200 2 2 0 13 Sophomore No Olympic 12 8 68 162 3 2 0 14 Junior No Nobel 6 1 68 135 2 3 4 a) (2 points) How many cases does this data set have? How many variables does this data set have? b) (4 points) Classify each of the following variables as either quantitative or categorical: I. Year II. Award III. Height iv. Piercings c) (5 points) Consider the variable Piercings, which give the number of piercings the student has. Find the five number summary for this variable. d) (4 points) Find the IQR for Piercings and use it to determine if there are any outliers for the variable Piercings.

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Remaining Time: 59 minutes, 17 seconds. Question Completion Status: QUESTION 3 Sony produces cameras according to $Q = 30 - 2L + L^2$ in a perfectly competitive market. If labor costs $50 and cameras sell for $5, the optimal quantity of labor is: ? 0. ? 2. ? 5. ? 7. ? 10. 2 points Save Answer QUESTION 4 My Big Banana (MBB) has a monopoly in Middletown on large banana splits. The demand for this delicacy is given by $Q = 80 - P$. MBB's costs are given by $TC = 40 + 2Q + 2Q^2$. Its profit-maximizing price is: Click Save and Submit to save and submit. Click Save All Answers to save all answers. 2 points Save Answer Save All Answers Close Window Save and Submit

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6 Siemens AG invests €81,000,000 to build a manufacturing plant to build wind turbines. The company predicts net cash flows of €16,200,000 per year for the next 5 years. Assume the company requires an 12% rate of return from its investments. (PV of $1, FV of $1, PVA of $1, and FVA of $1) (Use appropriate factor(s) from the tables provided.) (1) What is the payback period of this investment? Payback Period Choose Numerator: / Choose Denominator: = Payback Period Payback period = (2) What is the net present value of this investment? (Any losses or outflows should be entered with a minus sign.) Chart Values are Based on: n= i= Cash Flow Select Chart Annual cash flow Net present value Amount x PV Factor = Present Value =

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h) In a town, 400 families were randomly chosen of which 50% liked planting rice, 40% liked planting maize and 15% liked planting neither rice nor maize. i) How many family liked planting both of these? ii) How many liked planting only one?

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ashley p.