<p>When examining a parabola on a graph, how does one know whether the b in the (ax)squared + bx + c is negative or positive?</p>
<p>2nd question:</p>
<p>What was that formula that everyone uses for the rate x distance problems…?</p>
<p>From what i remember it was along the lines of:</p>
<p>2[speed 1 + speed 2]/ [speed 1 x speed 2}</p>