Could someone help me with my algebra expressions homework?

Three more than twice an unknown number of dollars
8 divided by an unknown number of cartoons
4 times an unknown number of persons decreased by 8
8 less than the sum of an unknown number of students and three
An unknown number of test items deminished by four
6 times the sum of an unknown number of computers and 3
One third of an unknown number of books increased by 8
The difference of an unknown number of records and 3 divided by 8
One-fourth of an unknown number of teachers tripled
The product of 3 and the sum of 8 and an unknown number of fish
An unknown number of tickets divided by 8
3 increased by the difference of an unknown number of coins and eight