Select the correct answer from each drop-down menu. The decibel level of a normal conversation, which has an intensity of 3.2 * 10-6 watts/m2, is _ dB. If the decibel level goes up to 80, the intensity of the sound will be _ watts/m2. Use the formula ,B=10log(I/Io) where B is the sound level in decibels, I is the intensity of sound you are measuring, and Io is the smallest sound intensity that can be heard by the human ear (roughly equal to 1*10(-12) watts/m2).

d. $180

step-by-step explanation:

if the dimensions of the room is 9ft by 12 ft, we have the area of the floor as,

so the area of the floor is 108 square feet, converting that into square yards we get,

the cost of carpet is $15 per square yard, therefore the cost of carpet for 12 square yards is,

hence, the cost of carpet is $180.

assuming the dimensions of the room be,

15 ft by 12 ft

so, the area of the floor of that room is,

we can convert 180 square feet into square yards, we know that,

1 sq ft = 0.111 sq yard

so, 180 square feet is,

so the area of floor is 20 square yards.

now, the cost of carpet is 15 dollars per square yard, therefore the cost of carpet for 20 square yards is,

so, it will cost $300.

60 for the first and 130 for the second

step-by-step explanation: