8. abcd is a parallelogram. if ab = 3x+4, and cd = 4x - 1, find the length of ab. (1 point)
dco
mmm
o20
019
017
015

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 midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2