- The average Speed from a point P to a point Q on a Time-Distance graph or grid

is calculated as the Speed = (change in Distance)/(change in Time) = slope PQ.

- The Speed from P(1, 80) to Q(3,120) is calculated as (120-80)/(3-1) = 40/2 = 20 km/h.

- The slope (rate or speed) from a point P(-2,-3) to a point Q(1,4) on an x-y graph

is calculated as the (rise)/(run) = (4-(-3))/(1-(-2)) = (7)/(3).

- Your Score Report appears after you have made 8 choices.

- Your Game Score is reduced by the number of butterfly hits.

- To slow the game speed repeat tap/click on the word

- To increase the game speed repeat tap/click on the word Math.

- Speed can also be adjusted with a keyboard's - and + keys.

- Refresh/Reload the web page to restart the game.

- Adjust the sound level of media on your device.

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