In the northern hemisphere as air moves towards low pressure it is deflected to the
right, causing a
circulation
pattern around the low pressure

As air tries to move from high to low pressure in the atmosphere, the Coriolis force diverts the air so that it follows the pressure contours. In the Northern Hemisphere, this means that air is blown around low pressure in an anticlockwise direction and around high pressure in a clockwise direction. Think about a person standing at the Equator.

complete the square on the right side of the equation;

-5(x + 0)^2 + 15

answer: d. y = -x^2 + 15