1 d. the minimum cost associated with a certain quantity produced. 2  e. 3  none of the above. 4  Assume that in the short-run a firm which is producing 100 units of output has average total costs of $200 and average variable costs of $150. In the short-run the Sure-Screen T-Shirt Company is producing 500 units of output. 2  Its average variable costs are $2.00 and its average fixed costs are $0.50. 3  The firm's total costs: 4  a. are $2.50.
According to Nancy Morgan, RN, at Wound Care Advisor, hydrocolloid dressings, such as Duoderm, need to be changed every three to seven days, depending on the amount of seepage from the wound. Duoderm Signal dressing contains a green line that indicates when the dressing needs to be changed. Keep Learning.
Based upon our research studies, the toothbrush should be changed every 2 weeks; at the beginning of an illness, when you first feel better, and when you feel well; and when you return from travel. It takes 2 weeks for the toothbrush to become contaminated to the point that it cannot be disinfected.ince toothbrushes can harbor so many bacteria, it is recommended that you change your toothbrush every 3-4 months. Donât wait until the bristles fray or your brush develops mold!!! Yesâ¦this can happen. Here are also other times when you want to change your toothbrush.