Question

2^3+2^2+2^1+2^0+2^-1+2^-2+2^-3= ayudaa

Answer 1

8+4+2+1+ 1/2 + 1/4 + 1/8
= 15+ 7/8
=(120+7)/8
=127/8

Answer 2

$2^{3} + 2^{2} +2 ^{1}+2 ^{0}+ 2^{-1} +2^{-2} +2^{-3}$

$8+4+2+1+ \frac{1}{2} + \frac{1}{4} + \frac{1}{8}$

$15+ \frac{7}{8}$

$\frac{127}{8}$