Asap with all questions will give brainliest!

The answer to your question is:

a) 42√2

b) √330

c)  12√-5

Step-by-step explanation:

a)

   4√27 + 6√75

27 = 3 x 3 x 3  = 3² x 3  

75 = 3 x 5 x 5 = 3 x 5²

    4√3² 3  + 6√5²3

   4(3) √3 + 6(5) √3

   12√3 + 30√3

   42√3

b)   √6 √11 √5

    √ (6x11x5)

     √ 330

c) 6√-20

20 = 2² x 5

  6√- 2² x 5

  6(2) √-5

  12√-5