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To find the value of the function when x = -4, simply plug in -4 for x in the function and solve:
y = 18(-4) - 13
y = -72 - 13
y = -85
Therefore, the value of the function y = 18x - 13 when x = -4 is -85.
None of the provided options (A. -16, B. -12.5, C. -15, D. -13.5) are correct.