1. Solve the following system of equations - += 3 + += 11 + +2=8 2. Find the extrema of the function z=-x2 -y+4(x-y). 3. Find the average value of function on the interval [a; b]: f(x) =, a= 1, b=2 4. Find the general solution for the differential equation y = y ' x 5. Find the Tailor series for the function y = cos2x about X = 0