$5\mathrm{.}13.$ Use linearity and time reversal properties of the DTFT to find the transform of the signals listed below:

a$.,x[n]=(2{)}^{n}u[-n-1]$

b$.,x[n]=(1\mathrm{.}25{)}^{n}u[-n]$

c$.,x[n]=(0\mathrm{.}8{)}^{|n|}$

d$.,x[n]=(0\mathrm{.}8{)}^{|n|}(u[n+5]+u[n-5])$