Use the principle of mathematical induction to prove that 1 x 2^1 + 2 x 2^2 + 3 x 2^3+...+n x 2^n = 2 + (n-1)2^n+1

The width of a rectangle is 20 units. can the perimeter p of the rectangle be 64 units when its length x is 11 units? no, because p = 2x + 2(20) no, because p ≠ 2x + 2(20) yes, because p ≠ 2x + 2(20) yes, because p = 2x + 2(20)