Sally and martha had the same number of postcards after sally sold 18 of her postcards martha had four times as many postcards as sally how many postcards did each girl have to begin with

The function y= x - 4x+ 5 approximates the height, y, of a bird, and its horizontal distance, x, as it flies from one fence post to another. all distances are in feet. complete the square to find and interpret the extreme value (vertex). select two answers: one extreme value and one interpretation.