On the HD Doppler Network display often shown on WRAL, negative strikes are color-coded with white lines and positive ones are yellow, with the amplitude, or peak intensity of each strike ...

For the constant negative acceleration graphs the initial displacement is negative and the initial velocity is positive.

Squaring positive or negative numbers always gives a positive value. The lowest value given by a squared term is 0, which means that the turning point of the graph \ (y = x^2 –6x + 4\) is given ...