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Answer each of the following two separate questions. 1. (15 points) Four machines contribute the following noise levels in dB to worker’s exposure: Machine 1: 80 dB; Machine 2: 86 dB; Machine 3: 93 dB and Machine 4: 70 dB. What is the combined noise-level exposure for this worker? 2. (15 points) Six machines all contribute equally to the noise exposure of one worker, whose exposure level is 89 dB for a full 8-hour shift. When all machines are turned off, the noise level is 70 dB. How many of the six machines should be turned off to achieve a full shift noise exposure level that would meet OSHA standards (AL of 85 dB) if the worker wears no personal protective equipment? Use approximation in your computations. Activa