Ahomeowner estimates that it will take 11 days to roof his house. a professional roofer estimates that he could roof the house in 6 days. how long will it take if the homeowner the roofer?

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 expressions are equivalent to -6 + 3m

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?