Strontium-90, a radioactive isotope with applications in medicine, has a half-life of approximately 30 years. A 225-gram sample of strontium-90 will decay to 100 grams after approximately years.

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Carla is saving money for a trip this summer. she already has some money in her savings account and will add the same amount to her account each week. at the end of 2? weeks, carla has? $130. at the end of 8? weeks, she has? $280. write a linear function in the form y=mx+b to represent the amount of money m that carla has saved after w weeks.