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Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

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!

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?