Ineed a bit of .. (brainliest + 15 pts)

Geometry paper. i don't know how to do the rest. questions 5. 8. 9. and 10.

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).

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²