You bought 3/4 pound of dry ice for an experiment. when the experiment was over, you found that you had used only 1/3 of what you bought. how much dry ice did you use?

You bought 3/4 pound of dry ice for an experiment. When the experiment was over, you found that you had used only 1/3 of what you bought.

How much dry ice did you use?

Yes 1/4 pound is the amount of dry ice you used

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)