IsTeenager = ( ( kidAge >= 13 ) && ( kidAge <= 19 ) ) ? true : false;
Another way:
if( ( kidAge >= 13 ) && ( kidAge <= 19 ) )
isTeenager = true;
else
isTeenager = false;
Explanation:
not A or D,
about B and C I'm not sure
A list is an R-object that can have a wide range of different items inside of it, including vectors, functions, and even another list.
The head() function lets you display the first observations in a data frame. The method tail() prints the final observations in your data collection in a manner similar to that. Both head() and tail() print a top line called the 'header', which contains the names of the distinct variables in your data collection. The R language's transform() function is used to alter data. The first parameter is transformed into a data frame. A suitable variable name comprises of letters, numbers and the dot or underline characters. The variable name does not begin with a number but rather with a letter or a dot.
Learn more about variable here-
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Pentaprism is a five sided prism with two silvered surfaces giving a non-stop deviation of all rays of light through 90 degress. Used in viewfinders of single-lens reflex cameras
