Subtract: (-2x^4-4y^3+4z^3+6)-(-9x^4-3y^3+4z^ 3+9)

3-12. write each answer with a reasonable number of figures. find the absolute uncertainty and percent relative uncertainty for each answer. (a) [12.41 (±0.09) + 4.16 (±0.01)] x 7.068 2 (±0.000 4) =? (b) [3.26 (±0.10) x 8.47 (±0.05)] - 0.18 (±0.06) =? (c) 6.843 (±0.008) x 104 + [2.09 (±0.04)- 1.63 (±0.01)] =?

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

Need this asap if anyone can i would be very grateful. if you could show workings that would really