To find the total resistance in a series circuit, you simply add up the resistance values of each resistor.
In this case, you have three 10.0 Ohm resistors connected in series:
Total Resistance (R_total) = R1 + R2 + R3
R_total = 10.0 Ω + 10.0 Ω + 10.0 Ω
R_total = 30.0 Ω
Therefore, the total resistance of the circuit is 30 Ω.