maths m1 revision guide question

q28. a particle is held at rest on a smooth slope by a horizontal force of magnitude 8 newtons as shown in the diagram . the slope is at an angle 60^o to the horizontal.
a. draw a diagram to show the forces acting on the particle.

b. by resolving horizontally show that the magnitude of the normal reaction force acting on the particle is approximately 9.24 Newtons.

c. find the mass of the particle , giving your answer to two significant figures.