Aplumber charges $50 to make a house call. he aslo charge $25.00 per hour for labor b. how much it cost for a house call that requires 2.5 hours of labor c. if the bill from the plumber is $162.50,how many hours did the plumber work at your house

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).

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

The radius of the base of a cylinder is 10 centimeters, and its height is 20 centimeters. a cone is used to fill the cylinder with water. the radius of the cone's base is 5 centimeters, and its height is 10 centimeters.