I am having trouble showing proofs question 1 is the most troubling, solving question 2 would also be most appreciated.

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

If g^-1(x) is the inverse of g (x) which statement must be true

42. if 20 men can eat 200 kg of wheat in 40 days, then 10 men can eat 300 kg of wheat in how many days? a) 120 days b) 60 days c) 80 days d) none of these