What is the simplest form of (3x+20)²

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

Find the commission on a $590.00 sale if the commission is 15%.

In a column proof the right column states your reasons