F(x) = input the x
3x+2
multiply it by 3 and add 2
3*x+2=
3*5+2=
15+2 =
17
or if you meant 2x:
it would be the same just do:
3+2x
3+2*5
3+10
13
The answer is (3). 5\12 1\4 = 37.5\150
1.5m= 150cm
37.5 + 50 = 87.5
87.5 x 12 = 750 750 \ 150 = 5
answer = 5\12
now this assuming that M partitions XY on a 4:1 ratio "from X to Y", Check the picture below.