1. A biologist is interested in knowing how the concentration of contaminant in a lake is...

 

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1. A biologist is interested in knowing how the concentration of contaminant in a lake is changing after a chemical spill. The biologist takes several measurements of the concentration of contaminant after the chemical spill. After 4 hours, she measures 450 milligrams of contaminant per milliliter. After 12 hours, the concentration has decreased to 60 mg/ml. From the data she determines the linear model: y = -48.75x + 645. (a) Use technology to complete the table below (you may round values as needed): x= number of hours after the spill 2. 4 8. 10 12 14 16 y- concentration of contaminant (in mg/ml) (b) Use technology to create a good graph of the equation. The table you created in part (a) should help you find a suitable grid. Recall that a good graph has the following criteria: o The graph is easily visible and somewhat centered on the screen o All the x-intercepts and y-intercepts are clearly visible o Any other important features (e.g., peaks, valleys, gaps, etc.) are visible Once you have created a good graph, recreate a simple sketch below and be sure to specify the smallest and largest x-values and y-values of the window you used. Note: the Step1 instructions on page 62 instruct you to, "make a table with appropriate X-values." The problem above illustrates that, "appropriate x-values" may depend on the problem situation. Since there was no contamination before the spill, the table started at x=0 instead of at x =-10 (as you did in previous problems). 1. A biologist is interested in knowing how the concentration of contaminant in a lake is changing after a chemical spill. The biologist takes several measurements of the concentration of contaminant after the chemical spill. After 4 hours, she measures 450 milligrams of contaminant per milliliter. After 12 hours, the concentration has decreased to 60 mg/ml. From the data she determines the linear model: y = -48.75x + 645. (a) Use technology to complete the table below (you may round values as needed): x= number of hours after the spill 2. 4 8. 10 12 14 16 y- concentration of contaminant (in mg/ml) (b) Use technology to create a good graph of the equation. The table you created in part (a) should help you find a suitable grid. Recall that a good graph has the following criteria: o The graph is easily visible and somewhat centered on the screen o All the x-intercepts and y-intercepts are clearly visible o Any other important features (e.g., peaks, valleys, gaps, etc.) are visible Once you have created a good graph, recreate a simple sketch below and be sure to specify the smallest and largest x-values and y-values of the window you used. Note: the Step1 instructions on page 62 instruct you to, "make a table with appropriate X-values." The problem above illustrates that, "appropriate x-values" may depend on the problem situation. Since there was no contamination before the spill, the table started at x=0 instead of at x =-10 (as you did in previous problems).

Answer rating: 100% (QA)

Bioavailability refers to the extent to which humans and ecological receptors are exposed to contaminants in soil or sediment The concept of bioavailability has recently piqued the interest of the haz... View the full answer