Solve. Round to the nearest ten-thousandth when necessary.An equation used in the study of Class C amplifiers is R = 
,where R is the internal resistance of the tube and ? is the angle that indicates the portion of the cycle during which the current is allowed to flow. Find the value of R when ? is 57°.
A. 0.3464
B. 5.839
C. 0.2714
D. 0.0556
Answer: D
Mathematics
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Find the sum.Find the sum of the first 30 terms of the arithmetic sequence: 7, 14, 21, 28, . . .
A. 3360 B. 217 C. 3265 D. 3255
Mathematics
Solve. The FDA approves a new drug and has confirmed by independent research that the strength of the reaction to the drug is given by the expression 
where d is the dosage of the drug and ? is a constant. Factor this expression.
A. d2
B. 
(? - d)
C. d2
D. 
Mathematics
Provide the appropriate response.Find the least positive number divisible by four primes.
A. 16 B. 210 C. 11 D. 30
Mathematics
Factor:
Mathematics