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In planning maintenance for a city’s infrastructure, a civil engineer estimates that, starting from the present, the population of the city will decrease by 10 percent every 20 years. If the present population of the city is 50,000, which of the following expressions represents the engineer’s estimate of the population of the city t years from now?
  • a)
    50,000(0.1)20t
  • b)
    50,000(0.1)t/20
  • c)
    50,000(0.9)20t
  • d)
    50,000(0.9)t/20
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
In planning maintenance for a city’s infrastructure, a civil eng...
, there are several important factors to consider. Here are some key aspects to keep in mind:

1. Asset inventory: Begin by creating an inventory of all the assets under the city's maintenance responsibility, including buildings, roads, parks, utilities, and any other public infrastructure. This will help in prioritizing maintenance tasks and allocating resources efficiently.

2. Condition assessment: Conduct regular assessments to evaluate the condition of each asset. This can be done through manual inspections, technology-enabled inspections (such as drones or sensor-based monitoring), or a combination of both. These assessments will help identify maintenance needs and potential risks.

3. Prioritization: Prioritize maintenance tasks based on the criticality, safety concerns, and impact on the community. Allocate resources accordingly to address high-priority items first. This may involve creating a maintenance schedule or implementing a computerized maintenance management system (CMMS) to track and manage tasks effectively.

4. Budgeting: Develop a maintenance budget that considers labor, equipment, materials, and any contracted services required. Ensure the budget is realistic and aligns with the city's financial capabilities. Regularly review and adjust the budget based on changing needs and priorities.

5. Preventive maintenance: Implement a preventive maintenance program to address routine tasks and avoid potential breakdowns or failures. This may include regular cleaning, inspections, lubrication, and minor repairs. Preventive maintenance helps extend the lifespan of assets and reduces costly emergency repairs.

6. Reactive maintenance: Despite preventive measures, some assets may still require reactive maintenance due to unexpected failures or emergencies. Develop protocols to address these situations promptly, including emergency response plans and communication systems.

7. Resource allocation: Allocate resources efficiently by assessing the availability and expertise of maintenance staff. Consider outsourcing certain tasks if it proves more cost-effective or if specialized skills are required.

8. Community engagement: Involve the community in maintenance planning by encouraging feedback, reporting issues, and conducting public consultations. This can help identify local concerns, generate support for maintenance initiatives, and foster a sense of ownership.

9. Documentation and record-keeping: Maintain comprehensive records of maintenance activities, including work orders, inspections, repairs, and associated costs. This documentation will provide historical data for future planning, budgeting, and decision-making.

10. Continuous improvement: Regularly review and evaluate maintenance processes, performance metrics, and community feedback to identify areas for improvement. Embrace new technologies, practices, and sustainability initiatives to optimize maintenance operations and enhance service delivery.

By considering these factors, a city can develop an effective maintenance plan that ensures the longevity and safety of its assets while meeting the needs of its community.
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Community Answer
In planning maintenance for a city’s infrastructure, a civil eng...
Choice D is correct. For the present population to decrease by 10 percent, it must be multiplied by the factor 0.9. Since the engineer estimates that the population will decrease by 10 percent every 20 years, the present population, 50,000, must be multiplied by (0.9)n, where n is the number of 20-year periods that will have elapsed t years from now. After t years, the number of 20-year periods that have elapsed is t/20. Therefore, 50,000(0.9)t/20 represents the engineer’s estimate of the population of the city t years from now.
Choices A, B, and C are incorrect because each of these choices either confuses the percent decrease with the multiplicative factor that represents the percent decrease or mistakenly multiplies t by 20 to find the number of 20-year periods that will have elapsed in t years.
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In planning maintenance for a city’s infrastructure, a civil engineer estimates that, starting from the present, the population of the city will decrease by 10 percent every 20 years. If the present population of the city is 50,000, which of the following expressions represents the engineer’s estimate of the population of the city t years from now?a)50,000(0.1)20tb)50,000(0.1)t/20c)50,000(0.9)20td)50,000(0.9)t/20Correct answer is option 'D'. Can you explain this answer?
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In planning maintenance for a city’s infrastructure, a civil engineer estimates that, starting from the present, the population of the city will decrease by 10 percent every 20 years. If the present population of the city is 50,000, which of the following expressions represents the engineer’s estimate of the population of the city t years from now?a)50,000(0.1)20tb)50,000(0.1)t/20c)50,000(0.9)20td)50,000(0.9)t/20Correct answer is option 'D'. Can you explain this answer? for SAT 2025 is part of SAT preparation. The Question and answers have been prepared according to the SAT exam syllabus. Information about In planning maintenance for a city’s infrastructure, a civil engineer estimates that, starting from the present, the population of the city will decrease by 10 percent every 20 years. If the present population of the city is 50,000, which of the following expressions represents the engineer’s estimate of the population of the city t years from now?a)50,000(0.1)20tb)50,000(0.1)t/20c)50,000(0.9)20td)50,000(0.9)t/20Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for SAT 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In planning maintenance for a city’s infrastructure, a civil engineer estimates that, starting from the present, the population of the city will decrease by 10 percent every 20 years. If the present population of the city is 50,000, which of the following expressions represents the engineer’s estimate of the population of the city t years from now?a)50,000(0.1)20tb)50,000(0.1)t/20c)50,000(0.9)20td)50,000(0.9)t/20Correct answer is option 'D'. Can you explain this answer?.
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