A phone company has a monthly cellular data plan where a customer pays a flat monthly fee of $10 and then a certain amount of money per megabyte (MB) of data used on the phone. If a customer uses 20 MB, the monthly cost will be $11.20. If the customer uses 130 MB, the monthly cost will be $17.80.

a.Find a linear equation for the monthly cost of the data planCas a function ofx, the number of MB used.

b.Use your equation to find the total monthly cost (in $) if 250MB are used.

In 2003, the owl populationPin a park was measured to be 340. By 2007, the population was measured again to be 285. The population changes linearly. Let the inputtbe years since 2003.

a.Find a formula for the owl population, P.Let the input be yearstsince 2003. What does your model predict the park's owl population to be in 2019?