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1. [0/3 Points] DETAILS PREVIOUS ANSWERS TANAPCALC9 3.7.016. Let f be the function defined as follows. y = f(x) = 8x2 - 9r + 1 (a) Find the differential of f. dy = 19x - 9 X (b) Use your result from part (a) to find the approximate change in y if x changes from 2 to 1.97. (Round your answer to two decimal places.) dy = 14.13 x (c) Find the actual change in y if x changes from 2 to 1.97 and compare your result with that obtained in part (b). (Round your answer to two decimal places.) Ay = Need Help? Talk to a Tutor 2. [-/3 Points] DETAILS TANAPCALC9 3.7.018. Let f be the function defined as follows. y = f(x) = v9x + 3 (a) Find the differential of f. dy = (b) Use your result from part (a) to find the approximate change in y if x changes from 4 to 4.1 (Round your answer to three decimal places.). dy = (c) Find the actual change in y if x changes from 4 to 4.1 and compare your result with that obtained in part (b). (Round your answer to three decimal places.) Ay = Need Help? Talk to a Tutor 3. [-/2 Points] DETAILS LARAPCALC10 3.8.014. Use differentials to approximate the change in cost corresponding to an increase in sales (or production) of one unit. Then compare this with the actual change in cost. (Round your answers to two decimal places.) Function x-Value C = 0.075x