What’s the slope for this graphed?
A.1/2
B.-2
C.2
D.-3

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).

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r