If x = 5,
y = 4*5/2 = 10
Having more than one sample question in your test suite would be helpful, Minhaj, if only to prevent "answers" like this one.
Multiply a column by a row
Determine Whether an array is empty
kmph to mps
Area of a circle
Write a code that will follow the equation y = x * (x + x) * x.
Square root of a number
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