Help plzz I need the length of "b" and the answers and the steps to find that answer??? Plz help don't have a lot of time to submit this

Can someone 50 first drop menu 0.80 or 0.75 or 1.20 or 4.00 second drop menu 4.00 or 0.75 or 0.25 or 3.75 3rd 15,6,10, or 9 4th yes or no

I'm a polygon i have no parallel lines i am formed 3 line segments i have one right angle two of my angles are angles what am i

A50-foot ladder is leaning against a vertical wall. if the base of the ladder is 45 feet from the base of the wall, find the angle the bottling of the ladder makes with the ground.