Please answer this I need it asap

What is the value of the expression 9+n/3-6 when n = 12? 1. 5. 7. 12.

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

Solve the equation by completing the square. x^2+2x=17