Please help me understand how my professor solved this and plugged in the values

Problem 2: You are given a circuit that has a resistor in series with and AC power source. the value of the resistor is R, :=100.0 . and the power source produces the following AC signal I (t) = 10.0 . sin (100.0. t) , where I is the current though the resistor. (a) Calculate the RMS current. and (b) calculate the RMS voltage. (c) What is the peak voltage of the circuit. (a) 10.0 . A Irms = =7.07 A V2 ( 6 ) V rms = ITIns . RO =707 V (c) V peak := V Tmis . V.2 = (1.00 - 103) V