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Mathematics
Mathematics
Problem
The vector
K
\mathbf{K}
K
is written as
7
ı
^
−
9
ȷ
^
7\,\mathbf{î} - 9\,\mathbf{ĵ}
7
ı
^
−
9
ȷ
^
. What is the coefficient of
ȷ
^
\mathbf{ĵ}
ȷ
^
? a)
9
9
9
b)
−
7
-7
−
7
c)
−
9
-9
−
9
d)
7
7
7
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