The pressures caused by pure tones on the eardrum are sinusoidal. The change in pressure P in pounds per square foot on a person's eardrum from a pure tone at time t in seconds can be modeled using the equation P=Asin (2xft + d), where f is the frequency in cycle per second, and is the phase angle. When P is positive, there is an increase in pressure and the eardrum is pushed inward; when P is negative, there is a decrease in pressure and the eardrum is pushed outward. A graph of a tone P(t) = .008 sin 2x(274.42)t + shown to the right. Complete parts (a) through (c) below. [2(274.421+] is 008 Q 005 Q -.008 (a) Determine algebraically the values of t for which P = 0 over [0, .005]. The solution set is (Round to five decimal places as needed. Use a comma to separate answers as needed.) (b) From the graph and your answer in part (a), determine the interval for which P0 over [0, .005]. (Type your answer in interval notation.) (c) Would an eardrum hearing this tone be vibrating outward or inward when P