An exam consists of 10 true-or-false questions. if a student guesses at every answer, what is the probability that he or she will answer exactly 6 questions correctly?

Griffin ordered a pair of sneakers online. he had a $22 credit that he applied toward the purchase, and then he used a credit card to pay for the rest of the cost. if the shoes cost $58, how much did griffin charge to his credit card when he bought the sneakers?