Can someone help me please

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

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:

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct