anyone knows how to set up those problems. Much help appreciated

1.If : x2 8x = (x-4)/3. What is a value for x that makes this statement true?

2.A worker at an apple orchard is paid $ 15.00 per dozen for the first dozen apples he picks and $ 18.00 per dozen after that. If he picks 78 apples total, then how much will he be paid?

3. Tucker purchased a stock that immediately increased in value by 50%. Th next week it depreciated by 20% and sold the stock for $ 120,000. What was the original purchase price of the stock?

4. If x is positive and x is not equal to zero and y is not equal to zero, then all of the following are the negative except which one.

A. xy4

B. xsin(5pi/4)

C. xcos(pi/3)

D. (xy)2

E. xcos(2pi)

5 If a and b are prime numbers and a x b =x then which of the following could equal x?

A. 23 B. 12 C. 86 D. 77 E. 54