Mr. Smith marked up the price of his sofa by 15%. If the sofa originally cost $399, what is the new sale price?

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).

Why did the ice arena get so hot after the big game (this is math related google it to find the paper

Choose the more precise measurement. 26.4 cm or 8.39 cm