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It is -1/64.
1 divided by x to the third power equals x to the negative third. The derivative of x to the negative third is minus three x to the negative fourth.
(2)-1/3 x (4)-1/3 = (2 x 4)-1/3 = (8)-1/3 = 1/81/3 = 1/2
Multiplying a quantity by negative one just changes the sign of the quantity. Multiplying a positive one third by negative one makes it negative one third. -1/3
Add negative eleven to negative four and one third to obtain negative fifteen and one third: (-11) + (-4 1/3) = -15 1/3