Yes, that is correct. I would really encourage you to carry the units through from start to finish. It seems like extra work, but it can help detect errors.
Yes, you are correct!
type LCM, least common multiple
I think 72 is the LCM, least common multile, not GCF, greatest common factor.
Add 4 to both sides. Then, square both sides. Does that help?
To clarify: (-4)^4 is not equal to -256.
-256 is not the correct answer.
Yes! All answers are correct. Note that answer 4 could be reduced to 19/30 hours.
BUBBA's answers start with a wrong answer.
Correcting typo The line 5 = H = 1 shoud read: 5 = H - 1
For Further Reading