algebra
posted by Keaton .
3squareof 5b^9= what
someone please help me

Do you mean the cube root of 5b^9 or
sqrt(5 b^9) ?
The cube root of 5 b^9 is
[5^(1/3)]*b^3 = 1.710 b^3
You cannot solve for a numerical value unless you know the value of b.