Westonci.ca is the premier destination for reliable answers to your questions, provided by a community of experts. Discover a wealth of knowledge from experts across different disciplines on our comprehensive Q&A platform. Join our Q&A platform to connect with experts dedicated to providing accurate answers to your questions in various fields.

In a month, a family cell phone plan costs a flat rate of $69.99 plus $9.99 for each additional line. Let n equal the number of additional lines. Which expression represents the monthly cost of this plan?