During a science lab, four-fifths of the class completed the lab and earned a grade of 100. What percent of the class didnt earn a grade of 100? F. 60%
G. 80%
H. 20%
J.45%

Classify the following triangle check all that apply

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?