RAPID PLS In a hydraulic jack, the pipe below the load has an area of 4 m2, and the pipe through which the input force transmits has an area of 0.1 m2. What input force is necessary to balance a load of 9,000 N? A) 90 N B) 225 N C) 450 N D) 900 N

Of the ones listed here, the factor that had the greatest impact on the eventual destruction of native americans' ways of life was the development of the a) automobile. b) highway. c) railroad. d) steamboat.

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

If the value of cos330°is√3/2 then find cos 165°.