Math B Help!!!?

Question

Ok i don't know how to do this one and if any one can help me i will appreciated;

rad 75 + rad 48 divided by rad 3

Help guys and girls :)

here is a picture of the problem i need to do 13-20
but i have no idea how to do it.
[URL=http://allyoucanupload.webshots.com/v/2001781167670264754][IMG]http://aycu15.webshots.com/image/29134/2001781167670264754_rs.jpg[/IMG][/URL]

http://aycu15.webshots.com/image/29134/2001781167670264754_rs.jpg

Answer 1

rad 75 = rad (25 * 3) = 5 rad 3
rad 48 = rad (16 * 3) = 4 rad 3
( rad 75 + rad 48 ) / rad 3 = 9

Answer 2

13.9.90x²
14.10.4y to 4th power
15. ab²
16.8.6+6.9/1.73=5.17
17.2.24+3.38 /2.24= 2.732
18.10.39-12.25 /2.45= -0.76
19. 19.36+ 23.24 / 1.73 = 24.62
20. 13.42- 11.18/ 2.24= 1

n next ime look for the"√" on your calculator n solve.