Please help thank you!

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).

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).

The area of square garden is 300m squared. how long is the diagonal?