The best answer is that it reduces the level of ground water
R=U/I so
U=RxI
U= 10 x 42
U= 420 volts
I'm not 100% sure but I think the answer is 60.4, because you multiply 3.20 by 10, to get 32 - 9 = 23, then subtract 23 from 83.4. Hope this helps you, and good luck!!!
<span>a. the amount of matter in a given volume </span>
