(Difficulty: ✶✶) Consider the following finite support signal: x[n] = {(-1)"n for for n = 1, 2, 3 otherwise Consider also its periodic repetition y[n] = x[n+7k]. Compute the energy and power of both x[n] and y[n]. Note: write the answer as Ex Px Ey Py i.e. as a list of four space-separated integer numeric values. For a guide to entering numerical results, see here; infinity is written as oo, i.e. a double lowercase letter 'o' Enter answer here...