There are 14 people at a meeting, and they all shake hands with each other. what is the total number of hand shakes.

Me because some of question i don’t understand

The lengths of two sides of a right triangle are given. find the length of the third side. round to the nearest tenth if necessary. a) y = 12/5x + 39/5 b) y = 5/12x + 5/39 c) y = 12/5x - 39/5 d) y = 5/12x - 5/39

Find the quotient with the restriction.