2+2-1 this is a very hard question

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

Which of the following values cannot be probabilities? 0.08, 5 divided by 3, startroot 2 endroot, negative 0.59, 1, 0, 1.44, 3 divided by 5 select all the values that cannot be probabilities. a. five thirds b. 1.44 c. 1 d. startroot 2 endroot e. three fifths f. 0.08 g. 0 h. negative 0.59

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab