Simplify √20 × √3 × √18

A. 5√10
B. 6√30
C. 5√30
D. 6√10

Please don’t remove this question.
Or if you do please explain the reason.
Thank you :)

The floor plan of a room has a scale of 2.5 in.: 35 ft. in the drawing, the length of the room is 8 in. and the width of the room is 6 in. what is the perimeter of the actual room?

Prove that 3: 8 is equivalent to 12: 32.a. use diagrams to support your answer.

Asequence {an} is defined recursively, with a1 = 1, a2 = 2 and, for n > 2, an = an-1 an-2 . find the term a241