Someone help me answer this please y = 6х – 2х^2

What is the value of x? assume that the line is tangent to the circle.

Problem 3 a bank charges a service fee of $7.50 per month for a checking account. a bank account has $85.00. if no money is deposited or withdrawn except the service charge, how many months until the account balance is negative

If the average of x,y and z is 15 what is their sum