In need a serious help. I'm having a hard time. algebra is not my strongest subject. I struggle a lot to get started on these. Hopefully someone can help me.

Dakota puts $100.00 into an account to save for college. The account earns o yo interest, com annually. How much will be in the account after 15 years? a. Write an equation to represent the amount of money in the account after "t" years. b. How much will be in the account after 15 years? 6. Consider the sequence 5, 10, 3x + 5 a. If the sequence is arithmetic, find the value of x. Show your work. b. If the sequence is geometric, find the value of x. Show your work. 7. Rocky thought that he was making a sound investment by buying $1200 worth of Blockbuster stock 15 years ago. Unfortunately, his investment depreciated steadily, losing 20% of its value each year. a. Write an equation in the form y = ab to represent the value of his investment after any year "t". b. How much is the stock currently worth? 8. Assume that a used car loses 3% of its value every year. Suppose the initial value of the used car was $24,000. a. What multiplier would you use to calculate the car's new value? b. Write a continuous function, C(t) to model the value of the car after t years. c. What is the value of the used car after five years