The scale of a model train is 1 imch to 13.5 feet one of the cars of the model train is 5 inches long what is the length in feef of the actual train car

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.

3x + 4y = 5 x- 3y = -7 solve by substitution

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges