Verified answer

3)  

              \\\\\\\\\\\\\\\\\\\\\\\\\\\

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-----------o------------o------->x

         -0.4               3

x∈(-0.4; 3)

1)  5х+2>0

     5x > -2

       x > -2/5

       x > -0.4

            ////////////////////

--------o------------>x

       -0.4

x∈(-0.4; +∞)

2) 1/4 x >1  | * 4

          x > 4

          //////////////////////////

--------o---------->x

         4

x∈(4; +∞)