## WeBWorK Problems

### Why comments and latex $$do not work? ### Why comments and latex \( do not work? by ADAM SIKORA - Number of replies: 2 Hi, why comments and latex \( do not work in the problem below? (As in the screenshot.) ##DESCRIPTION ## Total Probability ##ENDDESCRIPTION ##KEYWORDS('probability') ## DBsubject('Probability') ## DBchapter('ConditionalProbability') ## DBsection('Total Probability') ## Date('6/3/2002') ## Author('Saad Ghahramani') ## Institution('') ## TitleText1('Fundamentals of Probability') ## EditionText1('3') ## AuthorText1('Saad Ghahramani') ## Section1('3.3') ## Problem1('6') ######################################################################## DOCUMENT(); loadMacros( "PGstandard.pl", # Standard macros for PG language "MathObjects.pl", "PGML.pl", #"source.pl", # allows code to be displayed on certain sites. #"PGcourse.pl", # Customization file for the course ); # Print problem number and point value (weight) for the problem TEXT(beginproblem()); # Show which answers are correct and which ones are incorrect showPartialCorrectAnswers = 1; Context("Numeric"); #Context()->texStrings; #BEGIN_TEXT BEGIN_PGML Let X, Y, and Z be random variables. Suppose that the variance of X is 0.7, Cov(X,Y) = 0.4, Cov(X,Z) = 1.2, and Cov(Y,Z) = 0.8. Find each of the following to two decimal places (if applicable). (a) \(Cov(2 Y, 3 X +1)$$

[____]{14.4}

# 4*9*0.4

(b)

Cov(2 X + Y, 3 X + 2 Z)

[____]{51.2}

# 4*9*0.7 + 4*4*1.2+ 9*0.4+ 4*0.8

END_PGML

#Context()->normalStrings;

ENDDOCUMENT();

### Re: Why comments and latex \( do not work?

by Glenn Rice -
In PGML use [Cov(2 Y, 3 X +1)] for latex, and [% this is a comment %] for comments. You should take a look at https://webwork.maa.org/wiki/Category:PGML and specifically https://webwork.maa.org/wiki/Introduction_to_PGML for more information on using PGML.

### Re: Why comments and latex \( do not work?

by Alex Jordan -

This problem uses PGML, with the statement wrapped in BEGIN_PGML...END_PGML. The math delimiters for PGML are different than for regular PG. They are not slash-parens.  Here is some documentation:

https://webwork.maa.org/wiki/Mathematical_notation_-_PGML

For inline math, the delimiters are [...].

For a comment in PGML, see: