Calculus
posted by Sarah .
Determine the value of k, so that u = [3,7] and v = [16,k] are perpendicular.

Calculus 
broday
they're parallel

Calculus 
Sarah
it says determine the value of k so that u and v ARE perpendicular .... if it was parallel, i don't think it would ask me to find k....... unless it's a trick question ...

Calculus 
Damon
slope of u = 7/3
so slope of perpendicular to u = +3/7
so
3/7 = k/16
7 k = 48
k = 48/7 
Calculus 
Reiny
or...
their dot product must be zero
(3)(16) + 7k = 0
7k = 48
k = 48/7 
Calculus 
Henry
thank you everyone
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