(Please help :) Look at the sequence of numbers in each question and write the expression using n (find the nth term, eg, 3n+6)

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Write an algebraic expression to match each statement a. four less than 8 times a number b. twice the difference of a number and six c. nine from a number squared

Alex took his brother to a birthday party. the party was scheduled to last for 1 and 3/4 hours but they stayed for 4/5 of an hour more. how long did she stay at the party?