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Refer to the accompanying graph to answer the next question.   Is this firm earning positive, negative, or zero economic profits?  

  If the marginal revenue curve of a perfectly competitive firm lies below the minimum point on its average total cost curve but above the minimum point on its average variable cost curve, the firm is realizing

Short Answer (10 points): Answer one of the following questions. Explain why Yogi Berra’s comment, “You got to be very careful if you don’t know where you are going because you might not get there” is relevant when discussing how to plan learning experiences for children. Explain why it is more satisfactory to select a curriculum topic based on the children’s interests than it is to select one the teacher chooses based on his or her own interests.  Why is it that teachers often fail to take the children’s interests into account

Cataracts are a _____________________ response

Graph B is listed as linear nonthreshold.

Which of these graphs represents a relationship where the exposure and the response are directly proportional and there is a threshold.

Epidemiology is the study of statistical analysis of data which compares the incidence of disease processes such as cancers and cataracts in irradiated vs non irradiated groups. 

Which one of these graphs represents the dose response from radiation therapy?

Which one of these graphs represents a linear, nonthreshold response?

a). Ammonium nitrate is a compound commonly used in fertilizers as a rich source of nitrogen. A 25.0 g sample of pure ammonium nitrate is analyzed. Calculate the amount in moles in this 25.0 g sample. (2 marks) b). A 75.0 g sample of a hydrated salt, commonly known as ‘blue vitriol’ or copper(II) sulfate pentahydrate, is used in a lab experiment. Calculate the total number of moles present in the 75.0 g sample. (3 marks)