1. **State the problem:** Simplify the expression $T=4+n(3-1)$. 2. **Apply the order of operations:** First, evaluate the expression inside the parentheses. $$3-1=2$$ 3. **Substitute back into the expression:** $$T=4+n\times 2$$ 4. **Rewrite the expression:** $$T=4+2n$$ 5. **Final answer:** The simplified form of $T$ is $$T=4+2n$$ This means $T$ depends linearly on $n$ with a slope of 2 and a y-intercept of 4.