____ is a combustible hydrocarbon gas consisting primarily of methane with small amounts of ethane and traces of butane, propane, pentane, and hexane.
A. Fuel oil
B. Solid waste
C. Natural gas
D. Geothermal energy
Answer: C
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What is the material in a bag of grass seed that adds bulk and weight but will not grow?
a. noxious weeds c. fertilizer b. filler d. inert material
External threads should have a lead-in for ____.
A. metal stress B. tooling C. ease of turning D. all of the above
Wood as siding and exterior trim is very desirable from a design standpoint; however, it does require regular ____.
A. refinishing B. painting C. maintenance D. replacement
An engineer planning for her son’s college education made deposits into a separate high-risk brokerage account every time she earned extra money from side consulting jobs. The deposits and their timings are as follows:
 FIGURE 1.png)
(a) If the account increased at 15% per year and inflation averaged 3% per year over the entire period, what was the purchasing power of the money in the account in terms of year zero CV dollars immediately after the last deposit in year 17?
(b) Use a spreadsheet to recalculate the purchasing power if the account actually earned 6% per year and inflation was higher than expected at 4% per year. Compare the purchasing power with the total amount deposited over the 17 years.