The situation that will help reduce frictional force. A. tearing of bike gears B. applying lubricants to tires C. rubbing together two hard objects D. sliding big boxes on the ramp from the truck Please answer my question I need it tommorow... ​

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters

5. which description does not guarantee that a quadrilateral is a squar ajo is a parallelogram with perpendicular diagonals 0% has all sides congruent and all angles congruent o has all right angles and has all sides congruent 10% is both a rectangle and a rhombus 30%

You buy 4 items that cost 2.69 14.45 8.05 13.95 what is the estimated total round to the nearest dollar