Triangles $bad$ and $bdc$ are right triangles with $ab = 12$ units, $bd = 15$ units, and $bc = 17$ units. what is the area, in square units, of quadrilateral $abcd$

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).

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.