At 4:00, Devon called 6 friends to let them know that the weather forecast called for snow. At 6:00, each of those friends called 6 other friends. At 8:00, each of those friends called 6 of their friends. Look at the image.
An image of one person on a phone connected to six other people also on phones. Each image of the six others has six snowflakes set vertically beneath it.