How to solve x^2+x-90=0 in completing the square method

Ineed to learn how to solve this problem

20 points! asap! a is known to be 6,500 feet above sea level; ab = 600 feet. the angle at a looking up at p is 20°. the angle at b looking up at p is 35°. how far above sea level is the peak p? find the height of the mountain peak to the nearest foot. height above sea level =

Can anyone me with 32,33,36,37,and 40.