Which of the following graphs represent a function

Find the vertex of the function given below y=x^2-6x+1

What is the sum of these mixed numbers 2 1/8 + 4 3/8

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!