The area, a, of a square whose side length is n

Step-by-step explanation:

the area of a square is the length multiplied the breadth

in a square, all sides are equal so:

A=n×n

A=n²

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%