Can you please help me solve these radical expressions?

Question

i dont know how to do these yet but they were in my summer math packet

√21

¯¯¯

9

√25

¯¯¯¯

36

3√48 - 2√75

Thanks in advance!

Answer 1

the answer is 98

Answer 2

1) square 21 then divide that answer by 9

2) square 25 and then divide by 36

3) square 48 then multiply by 3 and square 75 then multiply by 2 and then subtracted then two answers  

hoped that helped!!!

:)