Which of the following is NOT equal to ?
If the average of four numbers is 4, and if the number 6 is added to these four numbers, what is the average of all five numbers?
In the figure below, the centers of all three circles (the three points) lie on the same line. The radius of the middle-sized circle is twice that of the smallest circle. If the radius of the smallest circle is 1, what is the length of the boundary of the shaded region?
Which of the following is a factor of ?
All six sides of the polygon shown below are congruent. What is the value of x?
In the figure below, O1 and O2 are concentric circles and AB is tangent to O1 at C. If the radius of O1 is r and the radius of O2 is twice as long, what is the area of the shaded region?
One x-intercept of the parabola defined by the equation is within which of the following intervals?
The figure below shows a solid wooden cube with surface area of 9 square units on each side,except that a 1X1 square hole has been cut through the cube from one side to the opposite side.After the hole is cut,what is the volume of the remaining wood,in cubic units?
In the figure below, if AD≌DC, what is the perimeter of the quadrilateral that forms the boundary of the total region shown?
In a geometric series, each term is a constant multiple of the preceding one. If x and y are the first thwo terms in a geometric series, which of the following represents the third term in the series?