An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
Analyze the given expenses and net income.
Evaluate each option to determine its impact.
Option C reduces the recreation expense by $25 .
The best answer is C. C
Explanation
Understanding the Problem We are given a table with Recreation expense of $25 and Net Income of $130. We have four options to reduce expenses: a) college savings by $50, b) clothes by $75, c) recreation by $25, d) all of the above. The goal is to select the best option from A, B, C, and D.
Evaluating the Options We need to evaluate each option to determine if it results in a net positive impact.
Option A Option A: We don't know the college savings expense, so we cannot determine the impact of reducing it by $50.
Option B Option B: We don't know the clothes expense, so we cannot determine the impact of reducing it by $75.
Option C Option C: We can reduce the recreation expense by $25. The recreation expense is currently $25. Reducing it by $25 results in a recreation expense of $0. This is a viable option.
Option D Option D: Since we do not know the college savings and clothes expenses, we cannot determine the impact of reducing all expenses.
Conclusion Since we know the recreation expense, option C is the only viable option. Therefore, the best answer is C.
Examples
Imagine you're managing a lemonade stand. You have a certain income and various expenses like lemons, sugar, and cups. This problem is similar to figuring out where you can cut costs to increase your profit. By analyzing each expense and deciding where to reduce spending, you can optimize your budget and make more money. This kind of budgeting and cost-cutting analysis is useful in many real-life situations, from personal finance to running a business.
In a device delivering a current of 15.0 A for 30 seconds, the total charge is calculated to be 450 C. The number of electrons flowing through can be found by dividing the total charge by the charge of a single electron, resulting in approximately 2.81 x 10^21 electrons. Thus, about 2.81 billion billion electrons flow through the device during this time.
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