Which of the following is a true biconditional statement? O A. A U. S. citizen votes if and only if the person is at least 18 years
old.
B. The product of two integers is odd if and only if the two factors
are odd.
C. If a figure does not have four sides, then the figure is not a square.
D. A number is a real number if and only if it is a positive integer

step-by-step explanation:

ask goog great chance of finding the solution there

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°

sina-sinb

cosb+cosa

tana-tanb

cos0+cos x pi/3

20tan

step-by-step explanation: