4. If z, a+bi and z, c+di represent two complex numbers with real components a, b, c and d, then which of the following represents the coefficient of i in the product of z, and z,? (1) ac-bd

(2) ad-be

(3) ab+cd

(4) be+ad

Find parametric equations for the line tangent to the curve of intersection of the surfaces at the given point. surfaces: xsquared2plus+2yplus+2zequals=1212 yequals=33 point: left parenthesis 1 comma 3 comma five halves right parenthesis

Factor -8x3-2x2-12x-3 by grouping what is the resulting expression?

Compare the cost of the bike trips from the two companies shown. for both the cost in a linear function of the number of days which statements is true