Who is the only us president who invented and patented something

What did thomas daceport invert

What did otis invent  Need a fast answer

When was the first elevator built

Why is the PAR fraction less than the AR fraction?  How do you think the PAR fraction would be different if this study were done in […]

Needs used PayPal…. Should have recent transactions…inbox me if you have any.. Thank you… 

. A Furniture Company produces chairs and tables from two resources- labor and wood. Thecompany has 125 hours of labor and 45 board-ft. of wood available […]

Solve the following linear programming model graphically. using QM to graph: Minimize Z= 8×1 + 6×2  Subject to  4×1 + 2×2 > 20 -6×1 +4×2 < 12 X1 + x2 > 6 […]

Where was rhe yoyo invented