Which of the following is *not* a permitted variable name in R?
some-variable
Create a variable called mynum with the value 200.
mynum = 200
Create a character variable called mychar that contains the words "hello world"
mychar = "hello world"
Add 20 to your "mynum" variable and save it to a new variable, "mynum2"
mynum2 = mynum + 20
Use R to calculate 300 divided by 90 (you do not have to save it to a variable)
300 / 90
Use R to calculate 8 to the power of 4 (you do not have to save it to a variable)
8^4
Use the "log" function to compute the natural logarithm of 15
log(15)
The function "cos" computes the trigonometric cosine of a number. Use this function to compute the cosine of 15.
cos(15)