When the denominator a proper fraction is 99 what do you notice about the repeating digits in its decimal form

What is the value of the expression below? (81^2)^1/8

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

Find dy/dx using implicit differentiation ln(20+e^xy)=y