am having some problems with these equations

given tha f and g are functions where the target set and source sets are the set of real numbers and

f(x) = 10-3x

g(x) =2

1+3

calculate

i) f(2)

ii)g(-3)

iii) fog(2)

write down an expression giving

iv) g o f (x)

v)f-1(x)

again thanks for any help