Can you be detailed at the STEP FUNCTION. Thats all. Thanks!

A beam ABC rests on roller support at $B$ and a fixed support at $A.$ The beam ABC has a total length of $6000mm$ as shown in Figure $2$ above. There is a uniform load of $5k\frac{N}{m}$ that acts over section $AB.$ There is a point load of $10kN$ at the end of the beam at $C.$ The flexural rigidity of the beam is constant and of value EI$.$

a$)$ What are the equations of equilibrium involving the reactions and the applied load?

b$)$ What are the beam boundary conditions?

c$)$ Using step functions, write down an equation for the bending moment for the whole beam.

d$)$ Determine the reactions.

e$)$ Determine the deflection of point $C$ in terms of EI$.$