Help please Tell me how to find the periods on these show your work on how you did it! Thanks!

True or false? a triangle can be circumscribed about a given circle

Which of the following expressions is equal to 2x^2+8

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!