Welcome welcome page Zoom Room Zoom logo ToDoodles Jamboard logo Calculator scientific calculator on Desmos       valid HTML 4.01
Skill Topics
Shapeshifting Topic Mad Science Topic Justice Topic Typicality Study Skills
Application Topics
Playgrounds Health Decisions Topic Personal Finance Decisions Topic Business Decisions Topic
Resources
Being a Mather Class Library LCC Resources Achievements

Math OER
 Turn In Problems 
 Personal Finance Decisions — Bell Curves 

The greatest reward for a student is not a good grade. It is the willingness of his teacher to listen to him.

- Nikolay Konstantinov

homework turn in box You attempted the ten exercises for this topic. Those problems did not have an answer key. Use this form to ask me how well you did.

Before using this page, you should have your homework completed on paper. This page is only for submitting your homework. To be short and concise it lacks any diagrams, pictures, or tables needed to work the problems.

Answer every question. Then use the button at the bottom of the page to create a code by processing your answers. Copy-and-paste the code into an e-mail.

1. In which month does this household use the most electricity?

either January or February
either April or May
either July or August
either October or November

2. Which month has the least deviation from year to year?

April May June July

3. Someone asks, "What is this household's typical monthly electrical usage?" What would make a numeric answer to this question meaningful?

Let's limit the question to a season instead of the entire year
Let's look for most common, not most representative
Let's discard the data before December 2018 as obsolete
All of the above

4. When did this family replace their old electric furnace with a modern and more efficient heat pump?

December 2017 December 2018 December 2019

5. The total electrical usage for 2017 was 14,780 kilowatt hours. The total electrical usage for 2019 was 11,513 kilowatt hours. How much less electricity was used in 2019?

272 kilowatt hours 3,267 kilowatt hours

6. Electricity costs an average of 11.3 cents per kilowatt hour. How much less money was spent on electricity in 2019 than in 2017?

$31 $36 $369 $3,067

7. What was the percentage decrease of this household's total annual electricity usage when comparing 2017 to 2019?

22% 28% 78% 128%

8. In this city 80% percent of the electric power is from carbon-free hydroelectric energy, making an overall CO2 emission of 16.2 grams per kilowatt hour. How many kilograms of CO2 did this household's electric use create in 2019?

37 kg 47 kg 187 kg 239 kg

9. A typical gasoline automobile's emission is 8.8 kilograms of CO2 per gallon. This household's car gets 30 miles per gallon. How many miles would they need to drive to the equal CO2 emissions of their annual electricity use?

about 55 miles about 70 miles about 637 miles about 815 miles

10. That household actually drives 10,000 miles per year, which is equivalent to about 333 gallons of gasoline. Find this household's total kg of CO2 emissions for house and car, and then divide by 1,000 to convert kilograms to metric tons. Purchasing a carbon offset costs about $14 per metric ton of CO2. What is the value of the carbon offset cost for this household's house and car?

about $22 about $44 about $223 about $437