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Answer:
The cost in 2015 will be $283.45.
What is the reference point (t=0)?
d. The year 2005.
Step-by-step explanation:
The exponential growth model for the cost is the following:
In which C(t) is the cost after t years, is the initial cost and r is the decimal inflation rate
In this problem, we have that:
What will it cost in 2015 assuming the rate of inflation remains constant?
2015 is 10 years after 2005, so this is C(10).
The cost in 2015 will be $283.45.
The reference point is the year in which t = 0, so the year 2005.
The volume of a pyramid is given by:
Where:
• Ab is the area of the base,
,• h is the height.
In this case, we have:
• a = 3 units,
,• b = 7 units,
,• c = 9 units,
,• Ab = b * c,
,• h = a = 3 units.
Replacing the data in the formula above, we get:
Answer: 63 units³