Question

Please answer to the part A,B,C of the question below

In a normal respiratory cycle the volume of air that moves into and out of the lungs is about 494 mL. The reserve and residual volumes of air that remain in the lungs occupy about 1980 mL and a single respiratory cycle for an average human takes about 4 seconds. Find a model for the total volume of air Vt) in the lungs as a function of time. 01050- 34) 1980+ 494 sin ^t v A variable star is one whose brightness alternately increases and decreases. For one such star, the time between periods of maximum brightness is 3.8 days, the average brightness (or magnitude) of the star is 4.7, and its brightness varies by ±0.25 magnitude. Find a function that models the brightness of the star as a function of time (in days), t. (Assume that at t = 0 the brightness of the star is 4.7 and that it is increasing.) f(t) = If a circle has radius 10 cm, find the length of the arc subtended by a central angle of 108° 18.8 cm

Answer 1

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C. L108 360 18.84 cm