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a) Show all the forces acting on the block, in terms of only what's given (and g)

b) Draw a frictional force versus distance graph

c) Fins the area under the graph to deteminr the work done on the block

d) Find out how far the block slides down the hill

This is a doosey. I understand the setup for all of the steps,but the problem comes in verifying my algebra and making sure im using the right setup. all answers must be expressed in terms of the quantities given. I got some answers, most importantly that the distance is tan(theita)/a. Will someone help me OUT?!!