Multiply.-9x(2x + 8)
A. -18x2 - 72x
B. 2x2 - 72x
C. -18x2 + 8x
D. -90x2
Answer: A
Mathematics
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Multiply. Assume that no radicands were formed by raising negative numbers to even powers.4
(
+ 
)
A. 4
+ 7
B. 4
+ 28
C. 28
+ 28
D. 4
+ 7
Mathematics
Find the root. Assume that all variables represent nonnegative real numbers. 
A. 9x4y2 B. not a real number C. 3x2y4 D. 4.264x2y4
Mathematics
Find the inverse of the invertible matrix.
A. 
B. 
C. 
D. 
Mathematics
Find the coordinates of the midpoint of the line segment PQ.P(y, z), Q(z, y)
A. (y + z, y + z)
B. 
C. (yz, yz)
D. 
Mathematics