28. EPA: Wetlands Where does all the water go? According to the Environmental Protection Agency (EPA), in a typical wetland environment, 38% of the water is outflow; 47% is seepage; 7% evaporates; and 8% remains as water volume in the ecosystem (Reference: U.S. Environmental Protection Agency Case Studies Report 832-R-93-005). Chloride compounds as residuals from residential areas are a problem for wetlands. Suppose that in a particular wetland environment the following concentrations (mg/L) of chloride compounds were found: outflow, 64.1; seepage, 75.8; remaining due to evaporation, 23.9; in the water volume, 68.2. a. Compute the weighted average of chlorine compound concentration (mg/L) for this ecological system. b. Suppose the EPA has established an average chlorine compound concentration target of no more than 58 mg/L comment on whether this wetlands system meets the target standard for chlorine compound concentration.

28. EPA: Wetlands Where does all the water go? According to the Environmental Protection Agency (EPA), in a typical wetland environment, 38% of the water is outflow; 47% is seepage; 7% evaporates; and 8% remains as water volume in the ecosystem (Reference: U.S. Environmental Protection Agency Case Studies Report 832-R-93-005). Chloride compounds as residuals from residential areas are a problem for wetlands. Suppose that in a particular wetland environment the following concentrations (mg/L) of chloride compounds were found: outflow, 64.1; seepage, 75.8; remaining due to evaporation, 23.9; in the water volume, 68.2. a. Compute the weighted average of chlorine compound concentration (mg/L) for this ecological system. b. Suppose the EPA has established an average chlorine compound concentration target of no more than 58 mg/L comment on whether this wetlands system meets the target standard for chlorine compound concentration.

College Algebra

10th Edition

ISBN:9781337282291

Author:Ron Larson

Publisher:Ron Larson

Chapter6: Systems Of Equations And Inequalities

Section: Chapter Questions

Problem 17PS: Cholesterol Cholesterol in human blood is necessary, but too much can lead to health problems. There...

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Cholesterol Cholesterol in human blood is necessary, but too much can lead to health problems. There are three main types of cholesterol: HDL (high-density lipoproteins), LDL (low-density lipoproteins), and VLDL (very low-density lipoproteins). HDL is considered “good” cholesterol; LDL and VLDL are considered “bad” cholesterol. A standard fasting cholesterol blood test measures total cholesterol, HDL cholesterol, and triglycerides. These numbers are used to estimate LDL and VLDL, which are difficult to measure directly. Your doctor recommends that your combined LDL/VLDL cholesterol level be less than 130 milligrams per deciliter, your HDL cholesterol level be at least 60 milligrams per deciliter, and your total cholesterol level be no more than 200 milligrams per deciliter. (a) Write a system of linear inequalities for the recommended cholesterol levels. Let x represent the HDL cholesterol level, and let y represent the combined LDL VLDL cholesterol level. (b) Graph the system of inequalities from part (a). Label any vertices of the solution region. (c) Is the following set of cholesterol levels within the recommendations? Explain. LDL/VLDL: 120 milligrams per deciliter HDL: 90 milligrams per deciliter Total: 210 milligrams per deciliter (d) Give an example of cholesterol levels in which the LDL/VLDL cholesterol level is too high but the HDL cholesterol level is acceptable. (e) Another recommendation is that the ratio of total cholesterol to HDL cholesterol be less than 4 (that is, less than 4 to 1). Identify a point in the solution region from part (b) that meets this recommendation, and explain why it meets the recommendation.
11.18 The extent of disease transmission can be affected greatly by the viability of infectiousorganisms suspended in the air. Because of the infectious nature of the disease under study,the viability of these organisms must be studied in an airtight chamber. One way to do this is todisperse an aerosol cloud, prepared from a solution containing the organisms,into the chamber.The biological recovery at any particular time is the percentageof the total number of organismssuspended in the aerosol that are viable. The data in the accompanying table are the biologicalrecovery percentages computed from 13 different aerosol clouds. For each of the clouds, recoverypercentages were determinedat different times.a. Plot the data.b. Since there is some curvature, try to linearize the data using the log of thebiologicalrecovery.Cloud Time, x (in minutes) Biological Recovery (%)1 0 70.62 5 52.03 10 33.44 15 22.05 20 18.36 25 15.17 30 13.08 35 10.09 40 9.110 45 8.311 50 7 .912 55 7 .713 60 7 .7
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22 The Sanders Garden Shop mixes two types of grass seed into a blend. Each type of grass has been rated (per pound) according to its shade tolerance, ability to stand up to traffic, and drought resistance, as shown in the table. Type A seed costs $1 and Type B seed costs $2. If the blend needs to score at least 300 points for shade tolerance, 400 points for traffic resistance, and 750 points for drought resistance, show all your calculations on paper , take a picture, convert to pdf, and upload.Upload your excel file if applicable. Type A Rating Type B Rating Shade Tolerance 1 1 Traffic Resistance 2 1 Drought Resistance 2 5 a. Identify decision variables and formulate mathematical statement of objective function based on decisions variables. b. Formulate the constraints in terms of the decision variables. c. Draw the graph with 3 constraint lines and the object line and annotate the graph to identify the optimum. d. How many pounds of…
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Option 1: 2(lw + lh + wh), l + w + h, lwh Option 2: 3 layers of 10, 7 layers of 21, 3 layers of 21, 7 layers of 3 Option 3: volume, edge lengths, base area Option 4: equal to, less than, greater than
9.17 Iron Deficiency? Iron is essential to most life forms and to normal human physiology. It is an integral part of many proteins and enzymes that maintain good health. Recommendations for iron are provided in Dietary Reference Intakes, developed by the Institute of Medicine of the National Academy of Sciences. The recommended dietary allowance (RDA) of iron for adult females under the age of 51 years is 18 milligrams (mg) per day. A hypothesis test is to be performed to decide whether adult females under the age of 51 years are, on average, getting less than the RDA of 18 mg of iron. 9.25 Iron Deficiency? Refer to Exercise 9.17. Explain what each of the following would mean. a. Type I errorb. Type II error c. Correct decisionNow suppose that the results of carrying out the hypothesis test lead to rejection of the null hypothesis. Classify that conclusion by error type or as a correct decision if in fact the mean iron intake of all adult females under the age of 51 years d. equals…
3. Scenario It is believed that large doses of acetaminophen (the active ingredient in over the counter pain relievers like Tylenol) may cause damage to the liver in nearly half of those tested. A researcher wants to conduct a study to estimate if the proportion of acetaminophen users who have liver damage is the same as previously reported. For participating in this study, he will pay each subject $20 and provide a free medical consultation if the patient has liver damage. Part A If he wants to limit the margin of error of his 98% conﬁdence interval to 2%, what is the minimum number of subjects he needs? (answer should be in the form of x,xxx) the minimum amount of money he needs to set aside to pay his subjects? $ (answer should be in the form of $xx,xxx) Part B The amount you calculated in Part A is substantially over his budget so he decides to use fewer subjects. Will this change increase or decrease the width of his conﬁdence interval? Will this new confidence interval be…
How Do Communities Recover after Catastrophic Disturbance?
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A municipal solid-waste site for a city must be located at Site A or Site B. After sorting, some of the solid refuse will be transported to an electric powerplant where it will be used as fuel. Data for the hauling of refuse from each site to the power plant are shown in Table P2-4. If the power plant will pay $8.00 per cubic yard of sorted solid waste delivered to the plant, where should the solid-waste site be located? Use the city’s viewpoint and assume that 200,000 cubic yards of refuse will be hauled to the plant for one year only. One site must be selected.