- The derivative Sum Rule is used on a sum of terms such as y = u + v.

In general, the Sum Rule states that the derivative of the sum function y = u + v is y' = u' + v'.

This rule also includes the derivative of the function y = u - v , namely y' = u' - v'.

- For example, the derivative of y = (x

- The derivative of y = (2x

- This game also uses the following two rules:

1) The Power Rule for y=x

For example, the derivatives of y=x

2) The derivative rule for a Constant times a Function such as y=cu yields the derivative

dy/dx = c(du/dx).

For example, the derivative of y=8x

- Note that the three symbols dy/dx, y' and f '(x) all represent the same derivative of y=f(x).

- 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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