If three -fourth of a number is one -tenths ,what is the number ...​

Which is the graph of the piecewise function f(x)? f(x)=[tex]f(x) = \left \{ {{-x+1, x\leq 0 } \atop {x+1, x\ \textgreater \ 0}} \right.[/tex]

Which is the graph of f(x) = (4)x? image for option 1 image for option 2 image for option 3 image for option 4

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!