David is looking out of his window at the office building 40 feet away across the street from him. He determines that the angle of elevation to the top of the building is 62∘ and the angle of depression to the bottom of the building is 55∘. How tall, to the nearest foot, is the office building? Do not include units in your answer.

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.