The figure below is a contour diagram for z = f(x, y). Is fa positive or negative? Is fy positive or negative? Estimate f(2, 1), fr(2, 1), and fy(2, 1). 5 4 3 2 Y 10 14 18 1 2 3 4 5 Compute each derivative. 1. 3. 2. Z if z = 4. (3ry7 - 32ry +5ry) 3x5abc y 1 2x ay 8 OF (REVET) z (1,0.5) + if z=e+2y sin y OF (-10-/2) 6. fa if f(a,b)=e" sin(a+b) (sin(706) + In(0 + 6)) if Q = c(a Kb + a1) 5. 7. 8. 80 ak