## Section 5.7 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 â€śtimed examâ€ť when hosted on Runestone, and (b) a student will have 10 minutes to complete the collection.

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!

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.

(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: SectionÂ 5.7 versus ExercisesÂ 5.7.)

### Exercises Timed Exercises

True.

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

False.

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

Green

Green means â€śgo!â€ť.

Red

Red is universally used for prohibited activities or serious warnings.

White

White might be hard to see.

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

#### 1. True/False.

Every vector space has finite dimension.

\(P_n\text{,}\) the vector space of polynomials with degree at most \(n\text{,}\) has dimension \(n+1\) by TheoremÂ 3.2.16. [Cross-reference is just a demo, content is not relevant.] What happens if we relax the defintion and remove the parameter \(n\text{?}\)

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

What color is a stop sign?