1. Which Biconditional is not a good definition? A: Two angles are supplementary if and only if the sum of their angles measures 180
B: Two angles are vertical angles only if they are not adjacent to each other are formed by two intersecting lines
C: Two angles form a linear pair if and only if the angles are adjacent
D: The sum of two angles if 90 is and only if those two angles are complementary

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

The function ƒ is defined by ƒ(x) = (x + 3)(x + 1). the graph of ƒ in the xy-plane is a parabola. which interval contains the x-coordinate of the vertex of the graph of ƒ?

An appliance store sells lamps at $95.00 for two. a department store sells similar lamps at 5 for $250.00. which store sells at a better rate