Can I please have assistance with the following review question for Contracts Law for Paralegals in Ontario.

Julie has just sold her paralegal business to Sam. In the agreement regarding the purchase, there is a provision that Julie cannot set up shop within a 15-kilometre radius of Sam's business for a period of three years. Discuss whether this restrictive covenant will be struck down as void due to unreasonableness. 2. Tyrone agrees to build a treehouse for Marina for $10,000. Tyrone builds the treehouse but fails to complete the secret passageway according to Marina's design. Marina claims that Tyrone has breached the contract and refuses to pay him the $10,000. Explain whether Tyrone can argue the doctrine of substantial performance because he has substantially complied with the terms of the contract. S The following advertisement was published in a newspaper: Gorgeous jewellery set on sale for $1. The jewellery will be sold to any person who shows up at Pat's Boutique on 100 Melrose Place. Using the \"reasonable person\" test, explain whether this advertisement will be considered a valid offer. Andrew rents a theatre from Barry for a performance. The theatre burns down, and it is now impossible for Andrew and Barry to carry out their contractual obligations. Describe how the courts may interpret or enforce this contract. Suppose X intends to contract with Y but mistakenly contracts with Z, thinking Zis Y. In what circumstances can X void the contract? In what circumstances would X be barred from voiding the contract