WeBWork Practice and Application 5

Question 1

A WeBWork problem says 'express your answer as a decimal rounded to 4 significant figures.' What does significant figures mean in this context?

Accepted Answer

The total number of meaningful digits in the number

Answer

Significant figures count all meaningful digits starting from the first non-zero digit.

Question 2

In WeBWork, which trigonometric function computes the inverse sine (arcsin)?

Accepted Answer

asin(x)

Answer

WeBWork uses asin() for the arcsine function; arcsin() may also work but asin() is standard.

Question 3

A WeBWork problem asks for the inflection points of f(x) = x³ - 6x² + 9x + 1. What are the inflection point(s)?

Accepted Answer

x = 2

Answer

f''(x) = 6x - 12 = 0 gives x = 2; since f'' changes sign at x = 2, it is the inflection point.

Question 4

When using WeBWork's 'Preview My Answers' feature, what is the primary benefit?

Accepted Answer

It shows how WeBWork is interpreting your typed expression before you submit

Answer

Preview renders your entered expression so you can confirm WeBWork parsed it the way you intended, without using an attempt.

Question 5

A WeBWork linear algebra problem asks for the determinant of the matrix [[3, 1], [2, 4]]. What is the correct answer?

Accepted Answer

10

Answer

det([[3,1],[2,4]]) = (3)(4) - (1)(2) = 12 - 2 = 10.

WeBWork Practice Test