This is for middle school for my grand daughter. please help.
1. a kite in the shape of a rhombus has diagonals that are 25 in long and 15 in long. what is the area of the kite?

2. the seat of a bench is in the shape of a trapezoid with the bases of 6 feet and 5 feet and a height of 1.5 feet. what is the area of the seat?

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