Ineed to find the perimeter of this trapezoid and also an expression for it

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

The highest point on earth is the peak of mount everest if you climb to the top you would be approximately 29,035 feet above sea level at remembering that amount is 5280 feet percentage of the height of the mountain would you have to climb to reach a point 2 miles above sea level

You buy five cds at a sale for $5.95 each. write an expression for the total cost of the cds. then use the distributive property and mental math to evaluate the expression.