
Concept explainers
a.
To calculate: The year in which the tablet computer sales reached 65 million.
a.

Answer to Problem 66E
The required for the arrow to hit a target that is 3 feet above the ground is 0.35 seconds.
Explanation of Solution
Given information:
The function:
Formula used:
Calculation:
The given function is
Substitute 65 for A in the above equation.
To solve the above equation, use the quadratic formula
The year after 2010 is positive.
So,
Hence, the tablet computer sales reached 65 million in 1 year.
b.
To calculate: The average rate of change from 2010 to 2012 and interpret the meaning in the context of the situation.
b.

Answer to Problem 66E
The model will no longer be accurate.
Explanation of Solution
Given information:
The function:
Calculation:
The given function is
For the year 2010; substitute 0 for t in the above equation.
For the year 2012; substitute 2 for t in the above equation.
To find the average rate of change, use the formula
Substitute 122 for
Hence, the required average rate of change is 52.5 million dollars.
c.
To determine: Whether the model will be accurate after a new, innovative computer is developed.
c.

Answer to Problem 66E
The model will no longer be accurate.
Explanation of Solution
Given information:
The function:
Calculation:
The given function is
If a new innovative computer is developed, people could change their preference from tablet computers to the new innovative computer which may cause the decrease of the sales of ntablet computers.
Hence, the model will no longer be accurate.
Chapter 3 Solutions
BIG IDEAS MATH Algebra 2: Common Core Student Edition 2015
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