SAT Practice, mixed Alg and Geom

If (x+y)² = 100 and (x-y)² = 16, what is the value of xy?

Point O is the center of the circle. Classify the triangle ABO.

PQRS&WXYZ both have perimeters of 12.  How many other inscribed rectangles have same perimeter?

If x represents an odd integer, which of the following represents the next odd integer > x?

The diagonal of the square is 12 units long. What is the radius of the circle?

Solve for x.

In ∆HJK, ∠JHK is a right ∠. Which length is greatest?

In an isosceles ∆ABC, AB>AC.  Which of the following must be false?

Gameboard divided into n x n squares.  What is a possible perimeter of the gameboard?

RT=TU. What is the value of x?

Which of the following represents all values of x that satisfy the inequality -1 ≤ 4x - 5?

If a film takes 90 minutes to show, 15 minutes in is what fraction of the movie?

In the figure, T and P are equidistant from O.  What are T's coordinates?