Plz solve and answer clearly. This subject was applied maximum and minimums

7. An open box is to be made from a square piece of cardboard whose sides are 10 inches long, by cutting squares of equal Size from the corners and bending up the sides. Determine the size of the square that is to be cutout so that the volume may be a maximum. A square with a side of length inches should be cutaway from each corner to obtain the maximum volume. (Round to two decimal places as needed.) 8. A rectangular plot of farmland will be bounded on; one side by a river and on the other three sides by a single-strand electric fence. With 2200 m of wire at your disposal, what is the largest area you can enclose, and what are its dimensions? The maximum area of the rectangular plot is 9. A company plans to enclose three parallel rectangular areas for sorting returned goods. The three areas are within one large rectangular area and 928 yd of fencing is available. What is the largest total area that can be enclosed? Select the correct choice below and fill in the answer box(es) to complete your choice. A.) The length of the shorter side of the larger rectangular area is yd and the length of the longer side of the larger rectangular area is yd. B.) The length of each side of the larger rectangular area is the same and measures yd. Please specify A or B and ll in answer clearly