The answer is 3n because the 3 is the coefficient
All you have to do is divided the other two numbers and than find out what y I and divide that than you will get it
I know that (5x+1)=3 is equal to x=2/5
which would give us 0.4
so just take 0.4 and round it to the nearest thousandth i believe
8^2+7^2=c^2, 64+49=c^2, 113=c^2, c=10.63