C. 5/2, 3 this is the answer
√(4) is equal to 4 raised to the (1/2). 1/2 as an exponent is between 0 and 1 and it means to take the square root.
So, 4^(1/2) = 2 (or -2)
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The bill = $190
Less flat fee = 25
Work done = $165
