Please show how you answer these questions, answers are included at the end of each question, thanks!

7 ) The heating element of a 120V , 1800w heator is 8.2m long if it is made of Iron what must is diameter be? (3.6 x 10 - 2 cm ) 8 ) A 15 2 electric heater operates on a 1201 outlet a ) what is the current in the heater ( I = 8 A ) . How much energy is used in 305 ( Vc = 2 . 9 * 10" J ) 10) A electric space heater draws 15A from a 120V source . If it operates for 5hrs a day. a ) How much power does the heater use? ( 1. 8 KW ) b ) How much energy in KWh does it use in a month ( 30 days ) ? (270 KWh ( ) At $ 0 . 11 per KWh. What does it cost per month ? ($ 29 . 70 )