What is 10/5.5 simplified

What are different types of statistical programs

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

You dug a hole that was 8 feet deep. after taking a short break, you dug down 3 more feet in the same hole. when finished digging, a tractor accidentally filled the hole with 4 feet of dirt. how deep is your hole now?