Use the substitution formula to evaluate the integral.
dx
A. 
B. 
- 
C. 
- 
D. 5
- 8
Answer: C
Mathematics
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Answer the question.Is f continuous at x = 4? 
A. No B. Yes
Mathematics
Solve the system of nonlinear equations using the method of elimination.
A. (0, 0)
B. (3
, 2
), (-3
, 2
), (3
, -2
), (-3
, -2
)
C. (3
, 2
), (-3
, 2
)
D. (-3
, -2
)
Mathematics
Find the standard-form equation of the ellipse centered at the origin and satisfying the given conditions.An ellipse with vertices (±8, 0) and foci at (±3, 0)
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics
Find the exact value of the expression.sec 150°
A. - 
B. 
C. - 
D. 
Mathematics