Which of the following is a geometric sequence? a
3, 6, 9, 12, … b
11, 15, 19, 23, … c
4, -16, 64, -256, … d
50, 25, 0, -25, …

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

The amount of money, in dollars, in an account after t years is given by a = 1000(1.03)^t. the initial deposit into the account was $_^a0 and the interest rate was _a1% per year. only enter numbers in the boxes. do not include any commas or decimal points^t. the initial deposit into the account was $__^a0 and the interest rate is % per year.

How can you tell when x and y are not directly proportional?