Find the power of i.i7
A. i
B. 1
C. -i
D. -1
Answer: C
Mathematics
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Solve the problem.Find the center of mass of a tetrahedron of constant density bounded by the coordinate planes and the plane 
.
A. 
= 2, 
= 
, 
= 
B. 
= 1, 
= 
, 
= 
C. 
= 
, 
= 
, 
= 2
D. 
= 
, 
= 
, 
= 4
Mathematics
Find the reciprocal.- 
A. - 
B. - 
C. -2
D. - 
Mathematics
Multiply and simplify. Assume that all variables represent non-negative numbers.(2
+ 4)2
A. 36 - 16
B. 36 + 16
C. 24 + 16
D. 4 + 16
Mathematics
Two sides of a right triangle ABC (C is the right angle) are given. Find the indicated trigonometric function of the given angle. Give exact answers with rational denominators.Find cot A when a = 4 and c = 9.
A. 
B. 
C. 
D. 
Mathematics