What are the answers?

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin

∆red ≅ ∆ by rule will give brainiest if possible