Which of the following expressions is equal to -x2 - 4?​

What is the value of x? enter your answer in the box. (cm)

The area of a rectangle is 54x^9y^8 square yards. if the length of the rectangle is 6x^3y^4 yards, which expression represents the width of the rectangle in yards

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?