For the function f(x, y) = y^2 + 3x^6 + 5y^4 identify whether the following points are local min's, local max's, or inflection points a) (0,0) c) is the function convex? why or why not?

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 if no money is deposited or withdrawn except the service charge, how many months until the account balance is negative