What is the final concentration if a saline solution consisting of 20% NaCl is diluted using a 1/4 solution?

What is the missing constant term in the perfect square that starts with x^2 -20x

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 =

What is the measure of sty in oo below? 130 310 230 50