Expand 2x(8x+5)
This is something required for me to learn and I havent got a clue

Find the value of the cosine for angle a

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

One positive number is 9 more than twice another. if their product is 95, find the numbers