Parallelogram K is decomposed to determine the area. PLEASE HELP

Which picture represents the correct way to decompose parallelogram K to determine the area?

What signals you that factoring by grouping is the best method to use when factoring a problem?

What is the total surface area of this square pyramid?

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field