How do I evaluate and interpret these sets of vectors and their geometric descriptions?

I do not understand how to write geometric descriptions or how the different boundaries change them in parts b,c, and d

v = [5,2] w = [1,2]

a) give a geometric description of the set of all vectors of the form v + cw, where c is an arbitrary real number

b) give a geometric description of the set of all vectors of the form av + bw, where 0 ? a ? 1 and 0 ? b ? 1

c) give a geometric description of the set of all vectors of the form av + bw, where a + b = 1

d) given a geometric description of the set of all vectors of the form av + bw, where 0 ? a, 0 ? b, a+b ? 1

*v and w are vectors, I am just not able to type the notation for it

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