I need help. Ive been on this question for a long time now im not getting it.

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Write an introductory paragraph for this corrie ten boom and her family were faced with some difficult choices after hitler came to power. some family members paid the ultimate price. write a carefully thought-out paper of at least 200 words dealing with the following concepts: --how should a christian act when evil is in power? --what do you think it would be like to live in an occupied country? remember to proofread anything you write thoroughly.

Which of the following is not a subset of {1,2,3}?