Answer:
1. t is a function used to transpose a matrix object. The object is passed as an argument to the function.
2. matplot is a graphical function in R used for data visualization.
3. The c function is used to combine arguments.
4. seq is an R function used to derive a range of numbers, optionally specifying a start, stop and step argument or simply a single numeric argument.
5. legends are used in data visualization to list and define items in the graphical presentation.
6. matrix is a function in R used to create and work with matrix and data frame objects.
7. rownames and colnames are functions used to label the row and columns of a data frame in R.
8. The typeof function return the data type of an object.
Step-by-step explanation:
The R programming language is a dedicated programming language for data analysis and visualization.