EASY ALGEBRA QUESTIONS!?!

I'm reviewing a practice midterm and I can't find what chapter in my book how to solve. I would prefer whoever answers these questions to focus on the word problem first because that seems to be the questions I am having most trouble with. Show all work and explain how you got your answer :) P.S. This is not homework it's practice and yes you have to do them all if you want to get 10 pts and best answer.

1) (2/5)x - (1/3)x = 2



3) A = (1/2)bh for h

Solve. If needed round money amounts to two decimal places and all other amounts to one decimal place.

4) The owners of a candy store want to sell, for $6 a pound, a mixture of chocolate-covered raisins, which usually sell for $3 per pound and chocolate-covered macadamia nuts which usually sell for $8 per pound. They have a 60-pound barrel of the raisins. How many pounds of the nuts should they mix with the barrel of raisins so that they hit their target value of $6 per pound for the mixture?

5)Due to a lack of funding, the number of students enrolled at butthole college went from 7000 last year to 4000 this year. Find the percent decrease in enrollment.


Thanks so much.