Write the following in set builder form and descriptive form:

$\left\{1, 4, 9, 16, 25, 36, 49, 64, 81\right\}$

Classify the following as finite, infinite, singleton and null sets. Also write their cardinal number.

$\left\{x: x \mathrm{is} \mathrm{an} \mathrm{even} \mathrm{number} \mathrm{not} \mathrm{divisible} \mathrm{by} 2\right\}$

Classify the following as finite, infinite, singleton and null sets. Also write their cardinal number.

$\left\{x: x \mathrm{is} \mathrm{a} \mathrm{day} \mathrm{of} \mathrm{the} \mathrm{week} \mathrm{after} \mathrm{Sunday} \mathrm{and} \mathrm{before} \mathrm{Monday}\right\}$

Classify the following as finite, infinite, singleton and null sets. Also write their cardinal number.

$\left\{x: x \mathrm{is} \mathrm{a} \mathrm{month} \mathrm{of} \mathrm{the} \mathrm{year} \mathrm{starting} \mathrm{with} \mathrm{the} \mathrm{letter} \mathrm{S}\right\}$

Classify the following as finite, infinite, singleton and null sets. Also write their cardinal number.

$\left\{x: x \mathrm{is} \mathrm{the} \mathrm{point}\left(\mathrm{s}\right) \mathrm{of} \mathrm{intersection} \mathrm{of} \mathrm{two} \mathrm{distinct} \mathrm{line} \mathrm{segments}\right\}$

Classify the following as finite, infinite, singleton and null sets. Also write their cardinal number.

$\left\{\mathrm{Multiples} \mathrm{of} 5 \mathrm{less} \mathrm{than} 50\right\}$

Classify the following as finite, infinite, singleton and null sets. Also write their cardinal number.

$\left\{x: x \mathrm{is} \mathrm{an} \mathrm{even} \mathrm{multiple} \mathrm{of} 11\right\}$

If $A=\left\{2, 4, 6, 8, ...\right\} B=\left\{3, 6, 9, 12, ...\right\}$, then fill the blank with the symbols $\in$ or $\notin$.

$22$_____$A$

If $A=\left\{2, 4, 6, 8, ...\right\} B=\left\{3, 6, 9, 12, ...\right\}$, then fill the blank with the symbols $\in$ or $\notin$.

$24$ $\_\_\_\_\_$$A \text{and} B$