1. **State the problem:** We are given several equations involving variables related to signal combinations and multitasking: - $IP = AP + IC$ - $I2 = D2 + C$ - $AP = RP + RC$ - $IC = AP + Rk$ We want to analyze these relationships and reduce expressions as requested. 2. **Substitute $AP$ from the third equation into the fourth:** Given $AP = RP + RC$, substitute into $IC = AP + Rk$: $$IC = (RP + RC) + Rk = RP + RC + Rk$$ 3. **Substitute $IC$ back into the first equation:** $$IP = AP + IC = (RP + RC) + (RP + RC + Rk) = 2RP + 2RC + Rk$$ 4. **Analyze the second equation:** $$I2 = D2 + C$$ This is already simplified. 5. **Summary of expressions:** - $IP = 2RP + 2RC + Rk$ - $I2 = D2 + C$ - $AP = RP + RC$ - $IC = RP + RC + Rk$ 6. **Regarding the extension "que Cel la = + Rk" and "en Reduzca la cantidad de sn7 +":** These seem incomplete or unclear, but if the goal is to reduce the number of terms involving $Rk$, note that $Rk$ appears only once in $IC$ and $IP$. **Final answers:** $$IP = 2RP + 2RC + Rk$$ $$I2 = D2 + C$$ $$AP = RP + RC$$ $$IC = RP + RC + Rk$$ These express the combinations of signals as sums of the given variables.