Question Number 192926 by Shrinava last updated on 31/May/23
$$\mathrm{1}.\:\mathrm{7}^{\mathrm{3}\boldsymbol{\mathrm{x}}−\mathrm{1}} \:\geqslant\:\mathrm{21} \\ $$$$\mathrm{2}.\:\mathrm{6},\mathrm{5}^{\mathrm{2}\boldsymbol{\mathrm{x}}} \:\geqslant\:\mathrm{200} \\ $$