16) Each week an album sells 6% fewer copies than it did the previous week. This week it sold 13,400 copies. At this rate, in how many weeks will it sell fewer than 2,000 copies? Round your answer up to the nearest week. 17) 2,630 Hz corresponds with which note? (Your answer must include the octave. For example, B3) 18) [2 points each] Without a microphone, a certain singer in the concert hall produces 67 dB. With a microphone, this increases to 79.5 dB. a) The sound intensity with the microphone is how many times the previous (unmiked) intensity? Round your answer to the nearest 0.1. b) How many times as loud does the singer sound to the audience when using a micrphone compared to without one? Round your answer to the nearest 0.1. 19) A section of four trumpets produces 88 dB. How many dB will be produced by a big-band section of 16 trumpets? Assume all trumpets produce an equal sound intensity and round your answer to the nearest 0.1 dB. 20) A contractor claims that their soundproong will result in only 29% of the sound intensity remaining inside a room. Assuming this is the case, the new sound intensity will sound what % as loud to people in the room as the pre-sound proofing level did? Round your answer to the nearest 1%