Add or subtract and simplify.(4 + 5i) - (-8 + i)
A. 12 + 4i
B. -4 + 6i
C. -12 - 4i
D. 12 - 4i
Answer: A
Mathematics
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Evaluate the integral.
A. 
sec-1 
+ C
B. 
sec-1 
+ C
C. 
sec-1 
+ C
D. 
sin-1 
x + C
Mathematics
Solve the problem.The area A = ?r2 of a circular oil spill changes with the radius. To the nearest tenth of a square foot, how much does the area increase when the radius changes from 3 ft to 3.1 ft?
A. 1.9 ft2 B. 9.4 ft2 C. 18.8 ft2 D. 1.2 ft2
Mathematics
Verify the identity.cos 
= -sin ?
What will be an ideal response?
Mathematics
Given that the point 
lies on the line 
, find k.
?
k = __________
Fill in the blank(s) with the appropriate word(s).
Mathematics