Help me please with this question:)

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

Asquare has a perimeter of sixteen centimeters. what is the length of each of its sides? a. 8 cm c. 9 cm b. 4 cm d. 10 cm select the best answer from the choices

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0