you are given an angle and the hypotenuse, which trig function would you use to find the adjacent side?

Does anyone know how to do geometryme with this problem

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!

Find the area of the regular hexagon if a side is 20 cm.