Simplify, choosing the correct answer as a mixed number in lowest terms. sqrt of 400/49

In triangle abc segment de is parallel to the side ac . (the endpoints of segment de lie on the sides ab and bc respectively). find de, if ac=20cm, ab=17cm, and bd=11.9cm;

How do you write y-10=2 (x-8) in standard form

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?