Ryan,
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I think you're mixing reactance and impedance concepts. Typically reactances are unsigned values in Ohms and designated by a variable "X", so ##X_L## for inductive reactance, and ##X_C## for capacitive reactance. Formulas employing reactances need to be careful of the signs of terms depending upon the circuitry being analyzed.
Impedances on the other hand, generally designated with "Z" variables, are complex numbers that incorporate sign, angle, and magnitude inherently. Formulas written for them treat them as straightforward values and don't require any unusual attention to signs for their terms.
In the formula you've written for ##Z_T##, which should be a simple sum of impedances, you've included "j"'s on the reactive terms and negated the capacitive term. But your variables ##X_L## and ##X_C## which you defined above already incorporate those things in their values. So including them again is not correct.
So. Just write a sum of impedances like any other sum: ##Z_T = R + Z_L + Z_C##. The variables themselves contain their own signs and complex components.
That said, you did write the correct sum when you substituted in the values. Clearly you ignored the signs that you placed in your algebra! Your result for the total impedance looks fine.
For the current that you calculated, recheck the angle for the result. In your ##I = V/Z## calculation the numerator is purely real (angle zero) and the denominator has a negative angle. What sign should you expect the angle of the result to have?
