G A 1.45-kg block is pushed against a vertical wall by means of a spring (k = 860 N/m). The coefficient of static friction between the block and the wall is 0.36. What is the minimum compression in the spring to prevent the block from slipping down?

The minimum compression is  

Explanation:

From the question we are told that

              The mass of the block is

               The spring constant is  

               The coefficient of static friction is  

For the the block not slip it mean the sum of forces acting on the  horizontal axis is equal to the forces acting on the vertical axis

     Now the force acting on the vertical axis is the force due to gravity which is mathematically given as

And the force acting on the horizontal axis is  force due to the spring which is mathematically represented as

where x is the minimum compression to keep the block from slipping

        Now equating this two formulas and making x the subject

substituting values we have

i was thinking more like reflects green light, just not sure

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c) both a and b.