Fill in the blank with the appropriate measurement relationship.12 in. = 
ft
Fill in the blank(s) with the appropriate word(s).
1 ft
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Experiments conducted by A. J. Clark suggest that the response R(x) of a frog's heart muscle to the injection of x units of acetylcholine (as a percent of the maximum possible effect of the drug) may be approximated by the rational function
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where b is a positive constant that depends on the particular frog. If a concentration of 20 units of acetylcholine produces a response of 40% for a certain frog, find the "response function" for this frog.
What will be an ideal response?
Find zw or 
as specified. Leave your answer in polar form.z = 8
w = 3
Find zw.
A. 24
B. 12
C. 12
D. 24
Find the indicated intercept(s) of the graph of the function.y-intercept of f(x) = 
A. 
B. (0, 0)
C. (0, 3)
D. none
A dietitian is asked to design a special dietary supplement using two different foods. Each ounce of food X contains 20 units of calcium, 15 units of iron, and 10 units of vitamin B. Each ounce of food Y contains 10 units of calcium, 10 units of iron, and 20 units of vitamin B. The minimum daily requirements of the diet are 350 units of calcium, 300 units of iron, and 400 units of vitamin B. Sketch a graph of the region corresponding to the system inequalities describing the different amounts of food X and food Y that can be used.
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A. ?
B. ?
C. 
D. ?
E. ?