A chemist is carrying out laboratory experiments to verify the operation of a new pharmacy on abacterium. The model makes a count of the number of bacteria present in the sample with respect to thetime in hours, from which the drug is supplied and is:N (t) = 10t³ - 255t² + 1800t + 1000a) According to the model presented, how many bacteria were counted before administering the drug?b) How long after the drug is administered do the first signs of its effectiveness appear? That is, at whatpoint do bacteria begin to decline?c) At what time does the drug show its best result? That is, at what time does it maximize and reach thelowest number of bacteria?d) If the drug must be administered again as soon as it begins to stop working, how long after should anew dose be administered?

The population of bacteria is defined using the equation: N(t)=10t3-255t2+1800t+1000, where t is the…

Answered: A chemist is carrying out laboratory…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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b) Data was collected on 344 corporate executives to find out the effect of MBA degree and work experience on their salary. The following model was estimated: Y = 2.3501 + 3.6306D11 – 2.6354 D2i + 0.8527 X¡ + 1.634 (D, * X)i (2.1805) (- 3.457) (1.263) (7.605) (2.98) R? = 0.8968 Y: Annual Income in Lakhs of Rupees Di and D2 are MBA and gender dummies respectively X: Work experience in years DI = 1 if one has MBA degree = 0 otherwise D2 = 1 for a female executive = 0 for a male executive i. Write the regression equations for female MBA executives and male MBA executives separately. ii. Find the mean income level for the reference category and interpret it. iii. Test the statistical significance of differential intercept coefficient between female MBA executives and Male MBA executives at 5% level of significance. iv. Interpret the coefficient of D,*Xi.
A 3-ply core/sheath yarn consists of a 250 denier (core) yarn, and two 200 denier (sheath) yarns. Analysis of the plied yarn showed that 1 mof the plied yarn has 1.08 m each of the two 200 denieryarns, and 1 m of the core yarn. (a) What is the denier of the plied yarn? (b) What is the cotton count of the plied yarn? Show calculations.
A student is taking courses at a local college as a prerequisite to get into a university program they are interested in. Their school uses a 4.0 GPA scale, meaning the highest possible GPA is 4.0. The average GPA for applicants accepted into their program of interest is 3.44. This student has already completed 3 semesters of their college program, with each semester consisting of 5 credits for a total weight of 15 credits. Their GPA over these 15 credits is 3.36. If they take a fourth semester with an additional 5 credits, what GPA must they obtain in their courses for the fourth semester (only the fourth semester) in order to bring their total GPA for all 20 credits across all four semesters up to 3.44?
A certain species of virulent bacteria is being grown in a culture. It is observed that the rate of growth of the bacterial population is proportional to the number present. If there were 1000 bacteria in the initial polulation and the number doubled after the first 60 minutes, how many bacteria will be present after 2 hours? a) 03,000 b) 07,000 c) 04,000 d) 06,000 e) 02,000
A town's raccoon population is growing exponentially. The expected population can be estimated using the relation P = 1350 (1.013)", where P is the population and n is the number of years. a) What was the current raccoon population? b) What is the expected population in 5 years?
calculator Google Search × New Tab Quiz: Practice Questions for Am × + tcinstructure.com/courses/2438849/quizzes/8459601/take D Question 1 uncements 123 les 3365 omes & Events ent Resources 1 pts Assuming there were no buying/selling fees, what would be the total capital gain if 107 shares of DCBA stock were purchased for $33.88 per share and all 107 shares were sold for $41.66 per share six months later? Round your answer to the nearest penny. Input just the number. Do not input the dollar sign. Do not use a comma. Example: 1021.57 Question 2 1 pts Updates e Evaluations Zoe was comparing the variability of three of her stocks. Over the last month EAC stock had a mean price of $32.81 per share with a standard deviation of $1.52, while FJF stock had a mean price of $44.28 per share with a standard deviation of $3.1, and QSR stock had a mean price of $51.7 per share with a standard deviation of $2.79. Out of these three stocks, what was the smallest coefficient of variation? Round your…
NASA is conducting an experiment to find out the fraction of people who black out at G forces greater than 6 Step 1 of 2 : Suppose a sample of 595 people is drawn. Of these people, 315 passed out at G forces greater than 6. Using the data, estimate the proportion of people who pass out at more than 6 Gs. Enter your answer as a fraction or a decimal number rounded to three decimal places.
QUESTION 2 COURSE CREDIT GRADE POINTS HOURS EARNED BIO-168 10 ENG-114 В 9. BAD-101 4 F МAТ-110 3 A 12 PED-129 1 A 4 Calculate the GPA by dividing the total grade points by the total credit hours. Round to two decimal places. The semester GPA is
FPME Q 4. The half-life of Plutonium-210 is 140 days. Suppose that a sample of this substance has a mass of 500 mg: a) How much of the sample will remain after 10 days? b) How long will it be until only 200 mg remain? asuites
A researcher records the following times (in seconds) that it took a group of students to complete an exam: 18 ± 2 min (M ± SD). How long did it take 80% of students to complete the exam? Select one: a. less than 16 min b. 16.32 min c. less than 18 min d. 19.68 min
Calculate the amount of rice bran (12.5% CP), corn (8.5% CP), soybean meal (49% CP) and copra meal (20% CP) in formulating 300 kg diet with 19% CP. Assume that the energy mixture will have a ratio of 2:1 and protein ingredients proportion is 1:3.

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