It depends on the expression.
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The minimum number of multiplications needed to compute x^768 is 9. This can be achieved by using the repeated squaring method, where x^2, x^4, x^8, x^16, x^32, x^64, x^128, x^256, and x^512 are computed, and then combined to get x^768.
That completely depends on the values of 'x' and 'y'. The value of that expression at any instant is exactly double the sum of 'x' and 'y', but as soon as either of them changes, the value of the expression likewise instantly changes. The only possible statement is that the value of the expression is minimum when the sum of 'x' and 'y' is minimum.
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www.astate.eduThe minimum score required in ACT for it is 17.