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What's the difference between: x≥0 and nonnegative integer. ?

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!

Given the graphed function below which of the following orders pairs are found on the inverse function