For the Credit level add the following extra 2 keys with the following

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Practice Problems

Task 3

For the Credit level add the following extra 2 keys with the following functionality:

S (or s) Square root key (takes square root of the display)

! changes sign of the display (positive numbers become negative numbers and vice versa)

Hint

Computer"The Positive numbers become negative numbers and negative becomes positive:One could use ABS function to convert the negative numbers to positive=ABS(reference cell)And, regarding, converting the positive numbers to the negative numbers, one could easily do that by multiplying the number with -1."...

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