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Mathematics, 21.06.2019 13:30
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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Mathematics, 21.06.2019 18:30
Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?
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Mathematics, 21.06.2019 19:50
Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4
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Mathematics, 21.06.2019 20:30
8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?
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