A seated normal adult breathes in and exhales every 4 seconds with a change 0.7 liter inhale and exhale. A normal adult will maintain a minimum of 1.35 liters during normal breathing. If you begin timing immediately following an exhale, then write a sinusoidal function that models the situation. How many liters will you have in the lungs at 3.5 seconds? At what time will you have 1.72 liters for the 4th time?

The edge of a cube was found to be 30 cm with a possible error in measurement of 0.4 cm. use differentials to estimate the maximum possible error, relative error, and percentage error in computing the volume of the cube and the surface area of the cube. (round your answers to four decimal places.) (a) the volume of the cube maximum possible error cm3 relative error percentage error % (b) the surface area of the cube maximum possible error cm2 relative error percentage error %