In a collection of nickels, dimes, and quarters the value of the collection is $12.85. If the number of nickels is 6 less than twice the number of dimes and the number of quarters is 5 more than twice the number of dimes, how many quarters are there?

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).

Use the function f(x) is graphed below. the graph of the function to find, f(6). -2 -1 1 2

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