Solve the following system by any appropriate method. If there is no real number solution, so state.y - 9x = 09x2 + y2 = 90
A. (1, 9)
B. (-1, -9), (1, 9), (-1, 9), (1, -9)
C. (-1, -9), (1, 9)
D. (-1, -9)
Answer: C
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A. Normal B. Not normal
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x is an even number}
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Solve the problem by integration.Under specified conditions, the time t (in min) required to form x grams of a substance during a chemical reaction is given by 
Find the equation relating t and x if x = 0 g when 
A. t = 
ln 
- 
ln 
B. t = 
ln 
+ 
ln 
C. t = 
ln 
- 
ln 
D. t = 
ln 
+ 
ln 