Please may I be shown how to solve these?

Q.9 Section 4-2: Lawnmower and Weed Wacker Ownership: [4 marks] The probability that a homeowner owns a lawnmower is 0.7. The probability that a homeowner owns a weed wacker is 0.5. The probability that a homeowner owns both a lawnmower and a weed wacker is 0.3. If a homeowner is selected at random, find: a) the probability that he or she owns either a lawnmower or a weed wacker. b) the probability that he or she owns a lawnmower, given that he or she does not own a weed wacker. Q.11 Section 5-2: Grab bags [3 marks] A convenience store has made up 20 grab bag gifts and is offering them for $2.00 a bag. Ten bags contain merchandise worth $1.00. Six bags contain merchandise worth $2.00, and four bags contain merchandise worth $3.00. Suppose you purchase one bag. What is your expected gain o loss