Which statement about k(x)=-x^2-2x+15 is true?

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 different types of statistical programs

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.