Find the value of a so that vectors 
and 
are perpendicular.
?
A. 
B. ?
C. ?
D. ?
E. ?
Answer: A
Mathematics
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Express the number in scientific notation.0.0000000155011
A. 1.55011 x 108 B. 1.55011 x 10-7 C. 1.55011 x 10-9 D. 1.55011 x 10-8
Mathematics
Factor by grouping.2x + 20 + xy + 10y
A. (y + 10)(x + 2) B. (y + 10)(2x + y) C. (x + 10y)(2 + y) D. (x + 10)(2 + y)
Mathematics
Simplify.
A. 
B. 6x
C. 
D. 12x
Mathematics
Find the sum of the first n terms of the following arithmetic sequence.a2 = 2, a5 = 47; n = 10
A. 610 B. -805 C. -610 D. 545
Mathematics