If the sides of a quadrilateral are in the ratio of 3: 5: 7: 9 and the perimeter is 240 inches, find the length of each side

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).

Which of the following expressions is equal to 2x^2+8

What is the slope of the line shown below?