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WGU Applied-Algebra Exam Syllabus Topics:

WGU Applied Algebra FXO2 PFXP C957 Sample Questions:

1. The logistic function f(x), whose graph is shown, models the number of people with a viral infection, where x represents the number of days since the outbreak of the virus and f(x) represents the number of viral infections.

What happens as time progresses from day 9 to day 12?

A) The number of people with the virus decreases faster and faster.
B) The number of people with the virus decreases slower and slower.
C) The number of people with the virus increases faster and faster.
D) The number of people with the virus increases slower and slower.

2. The scatterplot shows data on the popularity of a blog post over time. The graphed regression function has an r2value of 0.42.

Is it appropriate to make a prediction for the number of daily blog post views after 12.4 days?

A) Yes. The r2value indicates a moderate fit, and x=12.4 is within 25% of the range of the maximum value.
B) No. The r2value indicates a strong fit, but x=12.4 is more than 50% of the range beyond the maximum value.
C) No. The r2value indicates a moderate fit, but x=12.4 is more than 25% of the range beyond the maximum value.
D) Yes. The r2value indicates a strong fit, and x=12.4 is within 50% of the range of the maximum value.

3. A researcher collected data on the number of daily posts on a blog. The results are shown in the scatterplot.
The graphed regression function has an r
2
value of 0.89.

Is it appropriate to make a prediction for the number of daily posts after 18.6 months?

A) Yes. The r2value indicates a strong fit, and x=18.6 is within 50% of the range of the maximum value.
B) No. The r2value indicates a strong fit, but x=18.6 is more than 50% of the range beyond the maximum value.
C) Yes. The r2value indicates a moderate fit, and x=18.6 is within 25% of the range of the maximum value.
D) No. The r2value indicates a moderate fit, but x=18.6 is more than 25% of the range beyond the maximum value.

4. The graph shows the number of user accounts on a social media website over time.

When did the number of user accounts reach 4,500?

A) After 8.8months
B) After 3.2months
C) After 7.0months
D) After 2.0months

5. A researcher collected data on the number of annual bear sightings in a region over time. The results are shown in the scatterplot. A regression function is graphed with r^2=0.42. The predicted number of annual bear sightings after 19.5years is 62.2.

Is this prediction appropriate?

A) Yes. The r^2value indicates a moderate fit, and x=19.5is within 25%of the range of the maximum value.
B) Yes. The r^2value indicates a strong fit, and x=19.5is within 50%of the range of the maximum value.
C) No. The r^2value indicates a strong fit, but x=19.5is more than 50%of the range beyond the maximum value.
D) No. The r^2value indicates a moderate fit, but x=19.5is more than 25%of the range beyond the maximum value.

Solutions: