Sum or difference in simplest form 5/12 -1/4 =

Beth took out a $20,000 loan for college she is borrowing money from two banks. bank a charges an interest rate of 8.5% bank b charges and interest rate of 10.5% after one year alice owes $1860 in interest how much money did she borrow from bank a

Is the power produced directly proportional to the wind speed, give reasons for your answer?

With alll of except for the 2 that i did already