Question

michael started a savings account with $300. after 4 weeks, he had $350, and after 9 weeks, he had $400. what us the rate of change of money in his savings account per week?

Answer 1

`\begin{gathered} \text{rate of change =}\frac{change\text{ in y}}{\text{change in x}} \\ rate\text{ of change =}(400-350)/(9-4) \\ \text{rate of change =}(50)/(5) \\ \text{rate of change=10} \end{gathered}`