WGU Applied Algebra FXO2 PFXP C957 Applied-Algebra Prüfungsfragen mit Lösungen:

1. The value of a collectible artifact is represented by the function
f(x)=330× # 1.15 # ^x
In this function, xrepresents the number of years since 2005, and f(x)represents the value of the artifact, in dollars.
Which value represents the average yearly rate of change of the value of the artifact from 2006 to 2011?

A) 76.76
B) 163.26
C) 571.41
D) 383.81

2. The scatterplot shows data on the population of rabbits in a nature preserve. The graphed regression function has an r^2value of 0.94.

What is the appropriate range of x-values for extrapolation?

A) Extrapolation is not appropriate because r^2 < 1.
B) x=-4to x=28
C) Extrapolation is not appropriate because r^2 > 0.7.
D) x=0to x=24

3. The graph shows the number of people at an event venue after 3:00 p.m., in thousands.
Which rate of change is the greatest?

A) The instantaneous rate of change at point C
B) The average rate of change from point C to point D
C) The average rate of change from point A to point C
D) The instantaneous rate of change at point D

4. A researcher collected data on the number of large donations per year to a charitable organization. The results are shown in the scatterplot. A regression function is graphed with r^2.

What is the appropriate range of x-values for extrapolation?

A) Extrapolation is not appropriate because r^2 < 0.7.
B) Extrapolation is not appropriate because r^2 < 1.
C) x=-3to x=21
D) x=0to x=18

5. The number of letters processed daily at a mail center is modeled by the decreasing exponential function shown in the graph.

What is the long-term trend in the number of letters processed per day, based on the equation of the horizontal asymptote?

A) 1,000
B) 25
C) 2,250
D) 4,500

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