The orginal price of the chair was $545. The tax on the chair was 4.5%.What is the exact price of the chair including the tax?​

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

The pyramid shown has a square base that is 24 centimeters on each side. the slant height is 16 centimeters. what is the lateral surface area?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?