$3-$ Using $R$ as a Calculator

To begin with let us practice using $R$ as a calculator for basic arithmetic. Using lecture material perform the following computations in a new R chunk and return the outputs:

$\frac{1}{7}(4+3(23))$

$\sqrt[\phantom{2}]{1024}-e^{-2}$

$\frac{log(4)}{8+3-5}$

Hint: Recall that $R$ has functivnality for most mathematical operations, see functions sqrt$(),$ exp$()$ and $log().$

$4-$ String Concatenation

Enclosing any combination of numbers, letters or symbols in quotes $($single or double$)$ produces a character string.

Add an R chunk and write some code that prints "hello world".

In a new chunk, run the following code:

# defining variables

a "hello"

b "world"

In a third chunk experiment with using $+,$ paste$()$ and pasteO$()$ to combine strings. What do you notice?