Solve the system by the substitution method.y = x2 - 13x2 + y2 = 25
A. {(-3, -4), (3, -4)}
B. {(-4, 3), (-3, -4), (3, -4), (4, 3)}
C. {(9, 68), (16, 243)}
D. {(-4, 3), (4, 3)}
Answer: B
Mathematics
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Find the range of the given function.f(x) = -2x2 + 3x + 9
A. 
B. 
C. 
D. 
Mathematics
Use the method of variation of parameters to solve the differential equation.3
+ 140
+ 225y = -10e3x
A. y = C1e-45x + C2e-5x/3 + 
e3x
B. y = C1e-45x + C2e-5x/3 - 
e3x
C. y = C1e-45x + C2e-5x/3 - 
e3x
D. y = C1e-45x + C2e5x/3 - 
e3x
Mathematics
Find the average value of 
over the given region.
over the rectangular solid in the first octant bounded by the coordinate planes and the planes 
, 
, 
A. 
B. 2
C. 
D. 3
Mathematics
In triangle ABC, the measure of ?B is two times the measure of ?A. The measure of ?C is a thirty degrees month than ?B. Find the measure of ?B.
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Mathematics