Pls help extra points and mark brainlist

Aline on the wall and a line on the floor are skew. always, sometimes, or never?

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4

Do one of the following, as appropriate: (a) find the critical value z subscript alpha divided by 2 , (b) find the critical value t subscript alpha divided by 2 . 99%; nequals 17; sigma is unknown; population appears to be normally distributed.