What are the solutions to the quadratic equation x^2-16=0

How to determine whether two known pairs of points are on the same line.

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?

What is the distance from zero if a quadratic function has a line of symmetry at x=-3 and a zero at 4