the questions and show your work! 1. Find (fx) and (fy) f(x,y)= 2x/6+9y 2. Find all second-order partial derivatives of the given function. f(x,y)= e^4y-5x 3. Find all second-order partial derivatives of the given function. f(x,y) = ln (10xy) 4. Find all the local extremas for the function f(x,y) = 3x^2+4y^3-12xy+22 5. Find all the local extremas for the function f(x,y) = -4x^4+3y^4+32x^2-6y^2+2 and then match the equation with its graph