I need help with Geometry

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

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers