What is 0.499 rounded to the nearest cent

Given that abcd is a rhombus, what is the value of x?

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:

Ineed someone to me answer my question i have to have this done and knocked out