For what value of "a" will the product shown below have a purely imaginary value? (show work )

(4+5i)(a+2i)

5.25 ounces

step-by-step explanation:

divided 3/4 and 6

answer: (c) m∠qpo + (2x + 16)° = 180°

step-by-step explanation:

the opposite angles of a quadrilateral are supplementary.

so, ∠o + ∠q = 180°   and   ∠p + ∠r = 180°

since ∠r = 2x + 16°, we can use substitution as follows:

∠p + ∠r = 180°

∠p + (2x + 16)° = 180°