If x+y=10 and x - y = 11, what is the value of x - 72

Julia chooses a card at random from her set of cards. what is the probability that the card is labeled cat or hamster?

Henry is an avid reader, he devours 90 pages in half an hour how many pages has henry read per minute?

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.