To calculate the sum ot two vectors using the parallelogram method, where should the blue line be placed?
a. at the vertex between the green and red vectors c. at the tail of ONLY the green vector
b. at the head of the red vector
d at the head of the green vector

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).

Two parallel lines are crossed by a transversal. what is the value of x? x = 40 x = 70 x = 110 x = 130

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol