Find all the real square roots of 0.0081

What signals you that factoring by grouping is the best method to use when factoring a problem?

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?

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83