You and your friend are selling magazine subscriptions for a fundraiser. After w weeks, you have sold (7w+6) subscriptions and your friend has sold (9w+2) subscriptions.

a. Write an expression in simplest form that represents the difference between the number of subscriptions your friend has sold and the number you have sold.

A expression is __

b. After 8 weeks, your friend has sold __
more subscriptions than you.