Using diagonals from a common vertex, how many triangles could be formed from a 15-gon?

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)

Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. release your mouse button when the item is place. if you change your mind, drag the item to the trashcan. click the trashcan to clear all your answers. find the lateral area for the prism. l. a. = 0123456789

The equation of a parabola is given. y=18x2+4x+20 what are the coordinates of the focus of the parabola?