Plz solve these first three questions

Q1. Find the one-digit number x, if it is given that x ² = 32768.

Q2. Write the largest number by using (i) three 9's (ii) four 1' s.

 Q3.  If  'abcd is a 4-digit number which equals a^b × c^a , find a, b and c. 
         Evaluate :

           $$\begin{gathered} \left(\mathrm{i}\right) \frac{2}{{\left(25\right)}^{-1/2}} \left(\mathrm{ii}\right) {\left(-1000\right)}^{-4/3} \\ \left(\mathrm{iii}\right) 3 \times {10}^{3/2} \times {16}^{-1/2} \left(\mathrm{iv}\right) {16}^{1/4}\times \left({16}^{1/2} - {16}^{3/4}\right) \end{gathered}$$