Is this even possible? (please give a real answer with work)

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!

Prove that 16^4-2^13-4^5 is divisible by 11.

Aright cylinder has a diameter of 8 m and a height of 6m. what is the volume of the cylinder