The negative of lead aVR (R for right arm) is at +30 degrees; the positive of lead aVR is actually at -150 degrees. Although memorizing the above picture is crucial to accurately determining axis ...

The graph of \(y = x^2 + x − 6 \) crosses the \(x\)-axis at \(x = -3\) and \(x = 2\). The coefficient of \(x^2\) is positive, so the graph will be a positive U-shaped curve with a turning point ...