3(4+6)-16 what does it equal and how did you get the answer

Find x & pleeeeaaaassseeee me !

Which of the following constants can be added to x2 - 3x to form a perfect square trinomial?

Afarm is to be built in the shape of quadrilateral abcd, as shown below. all four sides are equal. a rhombus abcd is shown with diagonal ac equal to 15.5 feet and diagonal bd equal to 13.2 feet. what is the area of the farm? pleas only pick from the 4 below 62 square feet 52.8 square feet 57.4 square feet 102.3 square feet