The perpendicular to parallels theorem is based on.

a) the definition of congruent angles

b) the fact that corresponding angles are congruent

c) the fact that supplementary angles sum to 180 degrees

d) the perpendicularity postulate

The tiles below are pieces of a normal ecg tracing representing a little less than two heartbeats at a resting rate of 80 bpm. arrange the tiles in their correct order. rank from first to last. do not overlap any tiles.

Evaluate-27 ^4/3/8 a) - 81/16 b) 81/16 c) 16/81

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?