What is the value of x?

A.3√
B.21−−√
C.9
D.15

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).

What are the relative frequencies to the nearest hundredth of the columns of the two-way table?

Assemble the proof by dragging tiles to the statements and reasons column