I'm struggling in these questions. Please help me. Thank you so much!

Question 8 > 0/1 pt 9 3 99 0 Details Let y = 4vx. Find the change in y, Ay when x = 3 and Ax = 0.4 Find the differential dy when x = 3 and dx = 0.4 Submit QuestionQuestion 7 > 0/1 pt 9 3 99 0 Details Let y = 4x2 Find the change in y, Ay when x = 2 and Ax = 0.2 Find the differential dy when x = 2 and dx = 0.2 Question Help: DVideo Submit QuestionQuestion 6 0/1 pt 9 3 99 0 Details The circumference of a sphere was measured to be 73 cm with a possible error of 0.5 cm. Use linear approximation to estimate the maximum error in the calculated surface area. Estimate the relative error in the calculated surface area. Question Help: D Video Submit