Three-fourths of the 8th graders at Kingston Middle School went on the class trip. If 252 students went on the trip, how many 8 thgraders are there? (Show Work)

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

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

One number is 4 less than 3 times a second number. if 3 more than two times the first number is decreased by 2 times the second number, the result is 11. use the substitution method. what is the first number?