Someone help me with this ASAP

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

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 best way to answer questions with a x expression in the question. for example 3x + 10x=?