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General

For each task, each function should return a function closure, using the supplied arguments.

1. Translate the coordinates

The supplied arguments provide the amount to translate the coordinate pair along the x and y axis.

2. Scale the coordinates

The supplied arguments provide the amount to scale the coordinate pair for the x and y axis.

3. Compose transformation functions

The result of the first transformation is an array, but the transformation functions take two number arguments. You will have to get the values from the array.
Remember that the order in which the functions are performed matters.

4. Save the results of functions

For this function, you only have to memoize the result of the last transformation.
In order to send back the result of the last transformation, you will have to check if the input arguments are the same.