Assignment:
Q1. Express in terms of i.
4 square root of -255
Q2. Subtract.
(5x^6 + 9x^4 - 2x^3 - 3) - (8x^6 - 8x^5 + x^4 - 4)
Q3. Given the quadratic function f(x) = x^2 - 18x + 81, find a value of x such that f(x) = 16
Q4. Joe has a collection of nickels and dimes that is worth $7.65. If the number of dimes was doubled and the number of nickels was increased by 35, the value of the coins would be $14.30. How many nickels and dimes does he have?
Provide complete and step by step solution for the question and show calculations and use formulas.