What is the simplified form of 3 Start Root 5 c End Root times Start Root 15 c cubed End root?

Question

(1 point)
Responses

15 c squared Start Root 3 End Root

6 c squared Start Root 5 End Root

5 c squared Start Root 3 End Root

12 c superscript 4 baseline Start Root 5 End Root

Answer 1

5c^2 √3