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$$a_1, a_2, a_3,.................a_n,......$$

In the sequence shown, $$a_{1}=4$$, $$a_{2}=2$$, and for all integers n greater than 2, $$a_{n}$$ is equal to the sum of the squares of $$a_{n-1}$$ and $$a_{n-2}$$. How many of the first 60 terms of the sequence are multiples of 3?
Set S = {1, 4, 7, 10}
Set T = {2, 3, 5, 8, 13}
x is a number in set S, and y is a number in set T.
Quantity A: The number of different possible values of the product xy
Quantity B: 20
(51!-50!)÷(50!-49!)=?
Give your answer as a fraction.
The area of a square is 16. If its area increases by 6, then each of its side needs to be how much longer?

If ABCD is a square with area 625, and CEFD is a rhombus with area 500, then the area of the shaded region is?
Note: Figure not drawn to scale

BC//AD//EF, AD=9, BC=3, AB=4, CD=6
If the perimeter of CBEF is the same as DAEF, then the sum of AE+DF is?

Quantity A

The area of the shaded area

Quantity B

15



Quantity A

Length of AO

Quantity B

Length of AB



AB is a diameter of the circle above.

Quantity A

The length of AB

Quantity B

The average (arithmetic mean) of the lengths of AC and AD


If the difference between the radii of two concentric circles is 5, then what is the difference between their perimeters?

The figure above shows a rectangle inscribed in a large circle. Inside the rectangle is a small circle of radius 2 that is tangent to two sides of the rectangle. If the length of the rectangle is twice its width, what is the area of the large circle?
A square hole with a side of 1 foot needs to be totally covered by the base of a hemisphere. What`s the least length of the radius of the hemisphere?

The area of the shaded area is 12π. The smaller circle intersects with the bigger one at one point and passes through the center of the bigger circle. What is the diameter of the smaller circle?

The radii of the above two circles are both 3. If these two circles intersect at point P and point Q and each circle pass through the center of the other circle, then what is the total perimeter of the region (not counting the arc inside)?

If the area of the square is 196, when what is the area of the shaded area?

Each of the four semicircles shown in the figure has a side of the square as its diameter and has exactly one point in common with the larger circle. If each side of the square has length 4,what is the sum of the areas of the shaded regions?

Four same circles with a radius of 4 are inscribed in a larger circle. What`s the area of the larger circle?

Quantity A: x
Quantity B: y

Quantity A: AB
Quantity B: BC

A triangle is inscribed in a semi-circle with a radius of r
Quantity A: $$x^{2}+y^{2}$$
Quantity B: $$4r^{2}$$

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