We can write the set of all natural numbers using set
notation as {1, 2, 3, 4, ...}. Use set notation to express
each of these sets:
The set of all perfect squares of natural numbers
The set of all natural numbers that are less than 8.
The set of all odd integers that are greater than -4 and less
than 7.
The set of all solutions of the equation x^2=16
.