Solved
Help! "This variable is undefined"
I'm trying to use Mathcad to solve a series of equations. I keep getting the error message 
"This variable is undefined" Any tips?
1) You forgot to type multiplication dots when calculating A.t * (....). If you write A.t(...) then A.t is interpreted as function.
2) You have a unit mismatch in your second equation. The first summand has to be multiplied by a length (I had simply multiplied by 1m which sure is not correct)
