a.
To find is the value of a positive, negative, or zero.
a.
Answer to Problem 84E
The value of a is positive.
Explanation of Solution
Given:
The graph shows a quadratic function of the form
Concept Used:
When a >0 then graph of the parabola is open up.
When a <0 then graph of the parabola is open down.
Calculation:
Since the given graph is open up so a>0, a is positive.
b.
Write an expression in terms of a and b that represents the years t when the company had the least revenue.
b.
Answer to Problem 84E
Explanation of Solution
Given:
The graph shows a quadratic function of the form
Calculation:
The company would prefer a graph that is open upwards so that the revenue is least at
c.
The company made the same yearly revenues in 2004 and 2014.Estimate the year in which the company had the least revenue.
c.
Answer to Problem 84E
Company have least revenue in 2008 or at the middle of the graph.
Explanation of Solution
Given:
The graph shows a quadratic function of the form
Calculation:
The company made the same yearly revenues in 2004 and 2014.
So, company have least revenue in 2008 or at the middle of the graph.
Conclusion:
d.
Assume that the model is still valid today. Find is the yearly revenue currently increasing, decreasing or constant.
d.
Answer to Problem 84E
Yearly revenue increasing since curve of the graph upon the height.
Explanation of Solution
Given:
The graph shows a quadratic function of the form
Calculation:
Assume that the model is still valid today.
Then the yearly revenue increasing since curve of the graph upon the height.
Conclusion:
Chapter 2 Solutions
PRECALCULUS W/LIMITS:GRAPH.APPROACH(HS)
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