If a sphere has the same volume as a cube with edge length 5, estimate the radius of the sphere

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

Of the 304 people who attended a school play, 5/8 were students. how many of the people who attended were students.

Add, subtract, multiply, or divide as indicated. list any restrictions for the variable(s) and simplify the answers when possible. 1) x-2 / x+5 + 3x / 2x-1 2) x+6 / x-6 - x^2 / x+6 3) x+9 / x-4 + x+2 / x^2-11x+28 4) x / x^2-64 + 11 / 2x^2+11x-40 5) 5 / x + 11 / x-3 - x-4 / x^2+2x-15