List the elements of these sets, and find the number of elements in each set.

A is the set of the days of the week.

List the elements of these sets, and find the number of elements in each set.

B is the set of months of the year not containing the letter r.

List the elements of these sets, and find the number of elements in each set.

C is the set of factors of 12.

List the elements of these sets, and find the number of elements in each set.

D is the set of positive integers less than $30$ that are multiples of $4$.

Describe each set in words.

J = {1, 3, 5, 7, 9}

Describe each set in words.

K = {isosceles, equilateral, right-angled, scalene}

Describe each set in words.

L = {right angle, obtuse, acute, reflex}

Describe each set in words.

$M=\left\{4, 8, 12, 16, ...., 40\right\}$

Given the sets A = {$4, 6, 8, 10$}, B = {$1, 8, 27, 64$}, C = {$1, 3, 4, 7, 11$} and D = {$0, \pm 1, \pm 2, \pm 3, \pm 4$}, state whether the given statement is true or false. If the statement is false, write the correct statement.

$4\in$A