The following scatter plot represents the relationship between a person's weight and the number of calories the person burns in one minute of jump roping.

using the line of best fit, about what weight would a person be if they burned 15 calories per minute?

125 lbs.
150 lbs.
180 lbs.
220 lbs.

The vertical scale reads calories per minute, so we're interested in where the red line on the graph crosses the horizontal line at 15 calories per minute. That crossing point is more than halfway between 150 and 200 (pounds?) of weight. The only suitable choice from offered answers is
.. 180 lbs, the 3rd selection.

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm