Alan

"Three circles are drawn inside a rectangle as shown. Circle C has a diameter of 3, Circle D has a diameter of 4, and Circle E has a diameter of 6. Circles C and D are tangent, as are circles D and E. The circles are tangent to various sides of the rectangle. Find the length of segment AB"

"The twin paradox is an example of which of the following?"

time dilation

As follows:

As follows:

A fair decision would mean that all people get the same number of slips.  This could only happen with 8 people from the possibile numbers supplied.

"What is the radius of the smallest circle that contains both of the circles x^2 + y^2 = 1 and (x - 1)^2 + (y - 2)^2 = 4?"

As follows:

Here's a proof by induction:

As follows: