i need answers of a,b,c,d

11:01 Done 4 of 6 1, Consider the signal x (t) plotted below, at (5 points) Provide an expression for the signal x(t) using a combination of step functions (Le. sum/difference/product of step functions]. b) (10 points) Given the signal x(() plotted above, sketch the signal x (-+ 1) making sure to label the important points on both axes. c) (10 points) Given the signal x (t) plotted above, sketch the signal x(-2t)u(-21 - 1) making sure to label the important points on both axes, + 3