"Burns and Pugmire entered into a contract for the sale and purchase of real estate. The contract stated that the purchase price was $79,500, to be paid in installments of $675 per month, including taxes and insurance for the contract "period remaining, or until buyer elects to refinance." The contract was silent as to the closing date, which party was to pay closing costs, and when transfer of title and delivery of a deed would take place. Is this agreement sufficiently definite and certain? Explain."

and...

"The Bakers made a written offer to purchase Nelson's home. Nelson was unhappy with the down-payment provision and formulated an addendum that was added to the Bakers' original offer and returned to them. The Bakers signed it. Nelson then purported to accept the Bakers' offer by sending a mailgram to the Bakers that included financing terms that varied from those found in the original offer and also introduced additional terms relating to the fixtures and appliances. After receipt, the Bakers withdrew from the transaction in writing. Nelson maintains that there is a contract. Do you agree? Explain."