David worked seven hours and earned $117.25. If he earned $670, how many hours did he work?
2 answers:
You might be interested in
It belongs to the square root family. Your answer is B. Why the square root family? Because 
can be written as 
When you raise to 1/2 or 1/3 it is like saying the square root or the cube root.
When you raise to 1/2 or 1/3 it is like saying the square root or the cube root.