Part A
(i) will always ask you to write a system of equations
(ii) will always ask you to solve the system of equations
No work needs to be shown
Could be 2 to 4 parameters
Round to three decimal places. At least.
If the units are "thousands" or "millions" or anything like that, you can use 3.4 thousand or use 3400. Either is fine, but be consistent. Treat the number the same throughout the entire problem.