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
?
?
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?
Mathematics
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Find the product. Write the product in rectangular form, using exact values.[7(cos 120° + i sin 120°)] [2(cos 90° + i sin 90°)]
A. 14 - 14
i
B. 7
- 28 i
C. -7
- 7 i
D. 5
- 
i
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Determine ? in decimal degrees. Round results to an appropriate number of significant digits.tan ? = 0.545
A. 8.0° B. 8° C. 29° D. 29.0°
Mathematics
Perform the indicated operation.Let A = 
and B = 
. Find A - B.
A. 
B. 
C. 
D. 
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Find the domain and the range of the functions or relations from the graph.
A. domain: (-?, ?); range: [-?, - 2] B. domain: (-?, ?); range: (-?, ?) C. domain: (-?, ?); range: [- 2, ?) D. domain: [- 2, ?); range: (-?, ?)
Mathematics