Three spherical tennis balls are packed tightly into a cylindrical container, as shown in the diagram.
There is no space between the balls and either the side or the ends of the cylinder.
The diameter of each ball is d cm.
d cm
Find the ratio of the volume of the cylinder that is filled with the tennis balls to the volume
of empty space in the cylinder.
Give your answer in its simplest form.
[4 marks

Find the domain of the following expression: 1/(√x)-2

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)