Tony and some friends went to the movies. they bought 4 drinks and 2 tubs of popcorn and spent a total of $32.50 on the food. each drink costs $3.50 less than a tub of popcorn. write an equation that can be used to find the cost of one tub of popcorn.

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).

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Match the one-to-one functions with their inverse functions.