richard predicted that the number of Mango tree x, planted in a farm could yieli y=-20x²+2800x mangoes per year. How many trees should be planted to produce the maximum number of Mango per year?​

Darius is studying the relationship between mathematics and art. he asks friends to each draw a “typical” rectangle. he measures the length and width in centimeters of each rectangle and plot the points on a graph where x represents the width and y presidents the length. the points presenting the rectangles are (6.1, 12.0) (5.0, 8.1) (9.1, 15.2) (6.5, 10.2) (7.4, 11.3) and (10.9, 17.5). which equation could darius use to determine the length in centimeters of a “typical” rectangle for a given width in centimeters