$\left| \begin{array} { l l l } 3 & 7 & 4 \\4 & 3 & 2 \\2 & 5 & 1\end{array} \right|$

Q66: Solve using Cramer's rule, if possible.

Q67: Find the solution or solutions, if

Q68: A bank gives three loans totaling $280,000

Q69: Find the indicated sum or difference,

Q70: Find the solution or solutions, if

Q72: Find the indicated sum or difference,

Q73: The Hoffman Trucking Company has an

Q74: Find the solution or solutions, if

Q75: Solve the system graphically.<br>-The supply function

Q76: The following system does not have