Can someone help me out my grads are bad

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

Given ab and cb are tangents of p, and m =10°. what is the measure of abp?

Two line segments are shown in the figure below. suppose that the length of the line along the x-axis is 6, and the length of the hypotenuse of the triangle is 10. what is the equation of the hypotenuse line (shown in red, below)?