Plz help itz a hard question

Select the correct answer from each drop-down menu. rewrite the formula to find voltage. the formula for electrical power (p, in watts) is where v is the voltage in volts and r is the resistance in ohms. for a particular brand of water heater, r is 32 ohms and p is 0.5 watts. the formula to find v is , and the voltage at which the heater operates is volts.

What is the value of the expression 9+n/3-6 when n = 12? 1. 5. 7. 12.

Is this a polynomial function? i need to know asap