There are three points on a line, a, b, and c, so that ab = 12 cm, bc = 13.5 cm. find the length of the segment ac . give all possible answers.

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible

Which of the following constants can be added to x2 - 3x to form a perfect square trinomial?

If the diagram polygon abcd is a reflection across ef to make polygon a'b'c'd'.