exam Maths Puzzle Numerical Ability

Given f(x)=3x+4
Find f -1(x)

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exam Other Question

can you help me with problem? it is from a multiple choice hand out.

f is a function defined by f(x)= -x/5 and
g is a funciton defined by g(x)= 7-3x then
4g-5f=

thanks for any help In triangle RST, U lies of TS with TU:US = 2:3. M is the midpoint of RU. TM intersects RS in V. Find the ratio RV:RS.