Jose received $30 for his birthday and put it in his piggy bank. Each week, he puts 4 more dollars in his bank. The amount of money in dollars D in his bank is given by D = 4w + 30 where w is the number of weeks he has saved 4 dollars. His sister Marisol helped him find how much money he will have after 4, 15, 20, and 36 weeks. This table shows her results. What is the rate of change using Marisolâ€™s values for D and w? Is this a linear model or a non-linear model?

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