Chelsea uses gold chain to make bracelets. she has three pieces of unused gold chain. the lengths of these pieces are : 11 5/8 inches, 9 3/4 inches, 10 1/2 inches . what is the average of the three pieces of chain? show work

The function ƒ is defined by ƒ(x) = (x + 3)(x + 1). the graph of ƒ in the xy-plane is a parabola. which interval contains the x-coordinate of the vertex of the graph of ƒ?

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12