A triangle with vertices at A(20, -30), B(10.-15), and C(5,-20) has been dilated with a center of dilation at the origin. The image of B, point B', has the coordinates (2, -3). What is the scale factor of the dilation?
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There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

Asphere has a diameter of 10 in. what is the volume of the sphere?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)