Which of the following equations correctly represents the law of cosines? A. 2 = 22 + b2 - 2ab. cos(B)
B. 2 = 22 + c2 - 2ac. cos(C)
C. a2 = b2 + c2 - 2bc. cos(A)
D. b2 = 22 +62 - 2bc. cos(B)

D. b2 = 22 + 62-2bc.cos(B)

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°

answer: the distance

step-by-step explanation:

to calculate the distance d of a line segment with endpoints (x1, y1) and (x2, y2) use the formula d (x2 x1)2 (y2 y1)2. to calculate the midpoint of a line segment with endpoints (x1, y1) and (x2, y2) use the formula