8) What is the x value for x² + 62 = 126?

9) What is the square root of decimal number 550.37?

10) What is the length L2, if total length (L) is 2.75 metre and L1:L2 = 2:3?

11) How many days a mechanic takes to assemble 64 machines if he assembles 8 machines in 3 days?

12) What will be the rpm of smaller gear if a 180 mm dia meshes with 60 mm dia gear and the bigger gear makes 60 rpm?