INSTRUCTIONS: Identify whether each of the scenarios below represents a valid contract. If it is not a valid contract, indicate what is missing in order for it to be a valid contract with reference to relevant principles

SCENARIO	CONTRACT OR NOT?	IF NOT - WHAT'S MISSING?
Paulo sends a letter to Bill offering to sell him his fishing boat. The same day, Frank sends a letter to Paulo telling him that he would like to buy the boat.
Mary says to Martha, "I'll buy your old snowboard for $150". Martha replies, "I'll sell it to you for $175".
After reading an ad on Castanet, Brandon phones the seller and says he wants to buy the bike advertised for sale, but the price isn't listed.
Craig sees a flyer advertising a house for sale. He goes to the house and offers to buy it for the asking price.
Lindsay offers to buy Barbie's old desk for $50, and Barbie agrees.
Janine offers to help Amber move into her new apartment. Janine then spends an entire weekend helping Amber move. After they're finished, Amber tells Janine that she will pay her $100 for having helped her.
Jackie boards a city transit bus, pays her fare, and stays on the bus until it reaches her destination.

Braden is out for a walk when he notices a poster on a lamp post that offers a $100 reward for the return of a lost puppy. He looks, but does not find the puppy.

Gertrude gets an advertising flyer in her mail from a local perogie restaurant. The flyer says that they will deliver a perogie dinner for 4 to the house every Friday unless the home owner phones the restaurant to say "no". Gertrude ignores the flyer. The next Friday a perogie delivery is made to the house, and the delivery driver demands payment of $69.95.
Wally says to Winchel, "Dude - like I'll toss you a fiddy for your old iPhone 7". Winchel replies, "Dude - deal!". The two fist pump.
Tegan posts an ad on Kijiji to sell her prom dress. The ad states that the price is $400, and interested parties should email their offers to Tegan. Missy sees the ad, wants to buy the dress, and leaves Tegan a voice message offering to buy the dress for $400.
Farley says to Frederick, "Hey Freddy - would you sell me your Xbox game console for 4 free haircuts?" Frederick replies, "No, but I'll sell you my Xbox console for 6 haircuts." Farley says, "How about 5?" "OK", says Frederick.
Kailie needs a ride home from school, so she asks Kim if she would give her a ride home. Kim agrees and gives Kailie a ride home.
Desiree really needs to hire someone to clean her room, so she says to her neighbor Eric, "Yo...wanna make a few bucks by cleaning my room?" Eric says, "Sure, but will I have to disinfect it too?" "Na", she says, "It's actually pretty clean". "Sure", he says.