Get WGU Applied Algebra Exam Practice Questions - Real and Updated

Answer : C

The regression function has:

This indicates a moderate fit, not a strong fit. The model explains some of the variation in the data, but not as strongly as a model with an value closer to .

Now consider the prediction at:

From the scatterplot, the observed data values extend to about:

The prediction at is beyond the observed data, so it is an extrapolation. However, it is not very far beyond the data range.

Because is within a reasonable extrapolation range and the model has a moderate fit, the prediction is appropriate.

Answer : D

The function represents the total value of an investment account.

The horizontal axis represents:

The vertical axis represents:

We are asked to find the total value when:

To answer this from the graph:

Locate on the horizontal axis.

Move vertically upward until reaching the blue graph.

Read the corresponding value on the vertical axis.

From the graph, when , the value is slightly above , approximately:

So the total value of the investment account after 4 years is approximately:

Answer : D

The graph represents:

where:

The phrase ''decreasing faster and faster'' means two things are happening:

The graph is going downward, so the number of players is decreasing.

The graph is becoming steeper downward, so the rate of decrease is increasing.

This corresponds to a graph that is decreasing and concave down.

Looking at the graph, the number of active players reaches a maximum around:

After that, the graph begins decreasing. Near the far right side of the graph, especially around:

the curve is dropping more and more steeply.

That means the number of players is decreasing faster and faster on that interval.

Answer : C

The value measures how well a regression model fits the data.

Here:

This is a low value, meaning the model explains only about:

of the variation in the data.

That indicates a weak fit. When a model has a weak fit, using it for extrapolation is not reliable because predictions outside the data range may be very inaccurate.

Since:

the best conclusion is that extrapolation is not appropriate because the regression model does not fit the data well enough.

Therefore, the correct answer is:

Answer : D

This question asks us to identify a correct conclusion from the graph.

The vertical axis represents:

The horizontal axis represents:

From the graph, the lowest point occurs at the far right, around:

The corresponding number of homework problems is approximately:

So the minimum number of daily homework problems is , and it occurs at day .

Therefore, the correct answer is: