Which expression gives the distance from origin to a point with coordinates (x, y)

If you are just building your payment history, how many points from a perfect score will you possibly miss?

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x,y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me