a) 4x-16<0
4x>16
x>4
b) -2x+6≤0
6≤2x
x≥3
c) 6x+12>3x
3x>-12
x>-4
d) 0,4x+2≥0,8
0,4x≥-1,2
x≥3
e) √2x-√72>x√8
√2x-6√2>2x√2
x-6>2x
x<-6
f) 3,7x-18≥19
3,7x≥37
x≥10
g)2x/3-1/4≥5/7
56x-21≥60
x=81/56
h) (x+1)/3 < (2x+1)/4
4x+4 < 6x+3
1<2x
x>1/2
i) (x-3)/2 + x/3 <(3x-5)/4
6x-18+4x<9x-15
x<3