State whether the given pair of expressions are like terms. If they are like terms, add them.9xy, -12xy
A. Yes; -3xy
B. Yes; -3x2y2
C. Yes; -21xy
D. No
Answer: A
Mathematics
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Simplify.
A. 11
B. 
C. 121
D. 
Mathematics
Add or subtract. Express the answer as a mixed number.10
- 6
A. 16
B. 15
C. 3
D. 3
Mathematics
Solve the problem.Find the center of mass of a tetrahedron of constant density bounded by the coordinate planes and the plane 
.
A. 
= 
, 
= 
, 
= 1
B. 
= 
, 
= 
, 
= 
C. 
= 
, 
= 2, 
= 
D. 
= 
, 
= 1, 
= 
Mathematics
Write as a proportion.8.5 is to 8 as 25.5 is to 24.
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Mathematics