SB Exercises that are Timed

Section 5.20 Exercises that are Timed

This is a section that merely explains and holds an <exercises> division, which will be at the level of a <subsection>. There is a @time-limit attribute on <exercises>, set to the value 10, which implies (a) the collection of (two) exercises is a “timed exam” when hosted on Runestone, and (b) a student will have 10 minutes to complete the collection.

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Showing results, showing feedback, displaying a timer, and allowing pausing are all enabled by default. To disable any of these features, set the corresponding attributes on the <exercises> division, @results, @feedback, @timer, @pause, to the value no. As a test, we have turned off pausing. Don’t panic!

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Of course, if you are not viewing this while online and hosted on a Runestone server, then these exercises will not look any different than in other places.

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(Since this is an unstructured division, the number of the <exercises> is not displayed when born. It does have a number, which is the same as the enclosing <section>. To wit: Section 5.20 versus Exercises 5.20.)

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Exercises Timed Exercises

You have 10 minutes to do these exercises when hosted online on a Runestone server.

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1. True/False.

Every vector space has finite dimension.

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True.
The vector space of all polynomials with finite degree has a basis, $B = {1, x, x^{2}, x^{3}, \dots},$ which is infinte.
False.
The vector space of all polynomials with finite degree has a basis, $B = {1, x, x^{2}, x^{3}, \dots},$ which is infinte.

Hint.

P_{n},

the vector space of polynomials with degree at most

n,

has dimension

n + 1

by Theorem 3.2.16. [Cross-reference is just a demo, content is not relevant.] What happens if we relax the defintion and remove the parameter

n ?

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2. Multiple-Choice, Not Randomized, One Answer.

What color is a stop sign?

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Green
Green means “go!”.
Red
Red is universally used for prohibited activities or serious warnings.
White
White might be hard to see.

Hint 1.

What did you see last time you went driving?

Hint 2.

Maybe go out for a drive?

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You have attempted 1 of 3 activities on this page.

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