Please help me solve these two problems in a clear way, thanks!

7. (10%) In a single period inventory model, the demand occurs uniformly over the inventory period. The carrying cost is $2 per unit per year, the shortage cost is $10, and the item cost is $8. Assuming that the demand follows a uniform distribution over the range 100 to 200 . a. (6%) Please find Q b. (4%) Find Q if the demand follows a uniform distribution over the range 100 to 300 . 8. (9\%) Please connect show why the following scheduling objectives can be connected to operations indices: cost, quality, speed, flexibility, and dependability. Objectives: a. meeting due date b. Minimize average flow time c. Minimize \# of tardy job