A tablet data provider offers different plans for data usage. The plan Raul chose has a monthly fee of $29.99 per month for 5 GB of data with an additional cost of $10 for each gigabyte over 5. a. write an expression for raul's monthly data costs. b. Raul learns that his data provider is offering an unlimited data plan for $59.99 per month. Find the minimum number of gigabytes raul could use per month to make the unlimited plan cheaper than his current plan. Explain your solution process.