If you create your equations in MathType, your professor will also need
MathType or MathType Lite to edit the equations. MathType Lite is what you
get after you let the demo program expire, so free.

Thank You for bringing this problem up.

But I should also have said that the Design Science people, who make all
these programs, still consider MT Lite to be a better and more stable
program than Equation Editor. MT and MT Lite also create cross-platform
win/Mac equations while Equation Editor does not.

DMs