Review: Mix 10

Which of the following best describes one of the benefits of using an iterative and incremental process of

program development?

• It allows programmers to implement algorithmic solutions to otherwise unsolvable problems.

• It eliminates the need for programmers to test completed programs.

• It enables programmers to create programs that use the lowest-level abstractions available.

• It helps programmers identify errors as components are added to a working program.

The procedure DrawCircle (x, y, r) can be used to draw a circle on a coordinate grid. The circle is centered at the coordinate (x, y) and has a radius of r units. The procedure will be used to draw the following figure on a coordinate grid. Which of the following code segments can be used to draw the figure?

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A spinner is divided into three sections. The sector labeled Red is four times as large as each of the sectors labeled Blue and Yellow, which are of equal size. Which of the following correctly simulates the spinner?

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A social media site allows users to send messages to each other. A group of researchers gathered user data for the first

10 years of the site’s existence. Some of the data are summarized in the table below, along with some of the company milestones. The researchers noticed that the total number of registered users appears to be increasing at about a constant rate. If this pattern continues, which of the following best approximates the total number of registered users, in millions, in year 12 (two years after the last entry in the table) ?

• 30.6

• 31.2

• 31.8

• 32.4

Which of the following hypotheses is most consistent with the data in the table?

• The mobile app release did not have any effect on the average number of daily messages sent per user.

• The mobile app release discouraged new user registration on the site.

• The mobile app release led to users being less frequently active on the site.

• The mobile app release led to users tending to write shorter messages.

Which of the following best compares the values displayed by programs A and B?

• Program A and program B display identical values.

• Program A and program B display the same values in different orders.

• Program A and program B display the same number of values, but the values differ.

• Program A and program B display a different number of values.