(sqrt(10+sqrt(25+sqrt(108)+sqrt(154+sqrt(225))))sqrt(8))/(=)?

sqrt(10+sqrt(25+sqrt(108+sqrt(154+sqrt(225))))) is (a) 4( b) 6(c)8(d)10

sqrt(1521)+sqrt(225)=?

(sqrt10 + sqrt18)/(sqrt18 - sqrt(3 - sqrt5)) =

sqrt(-25)sqrt(36)

(sqrt(81)+sqrt(729))/(sqrt(225)-sqrt(9))=

sqrt(8 + sqrt(57 + sqrt(38 + sqrt(108 + sqrt(169)))))=?

Which of the following surd is the smallest ? sqrt(10)-sqrt(5),sqrt(19)-sqrt(14),sqrt(22)-sqrt(17) and sqrt(8)-sqrt(3)