The 3 goes with the square root you don’t need to multiply or anything like that. If you need to simply for example 3 square root of 20 which is when 3 is outside the square root sign. The 20 will be separated with 4*5 in the square root and then you will square root the 4 leaving the 5 in and bringing 2 out. Now you can’t just bring it out and forget about the 3 outside you need to multiply that 2 and 3 and you get 6! So you final answer is 6 square root 5. Hope this helps reply if you have a question!
If you turn the ratio 1:3 into a fraction it would be 1 over 3 I hope this helps
If every 10 minutes 3 buses leave then over a course of 60 minutes (1 hour ) 18 buses would leave
the answer is D if it is not then try A
