One basic assumption of linear programming is non-negativity. what does this imply and how reasonable is this assumption?

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

Which statement best explains why ben uses the width hi to create the arc at j from point k

I’ve been trying all day to figure this puzzle out. i need the work for it aswell. it is a factoring polynomials tarsia. the image is below.