Using arrange method is used to sort datasets as shown as follows:

# Sort the dataset in descending order of Income (high to low) 
arrange(tstate, desc(Income)) 
 
# Sort by Region and Illiteracy (within Region) 
arrange(tstate, Region, desc(Income)) 
 
## Mutate 
# The verb mutate is used to add new columns to a dataset, most commonly to represent a calculated value 
 
# For instance to find population on a per square mile basis: 
mutate(tstate, pop_per_sq_mile = Population/Area) 

If you want to keep only the newly created variable, use transmute, as shown:

transmute(tstate, pop_per_sq_mile = Population/Area) 
# # A tibble: 50 x 1 
# pop_per_sq_mile 
# <dbl> 
#   1    0.0712905261 
# 2    0.0006443845 
# 3    0.0195032491