Hi guys im quite confused here because my teacher talked too fast, can someone help me find out how did 4 turned into 64. heres my problem in the attachment.

The probability that an adult possesses a credit card is .70. a researcher selects two adults at random. by assuming the independence, the probability that the first adult possesses a credit card and the second adult does not possess a credit card is:

An object in geometry with no width, length or height is a(n):

Simplify using positive exponents only.