It think thw anwser is 15
.6 x 10^-3 (Move the decimal in a multiple of 3 and don't forget it's 6 tenths not the whole number 6) In scientific notation this would be;
(the whole number)6 x 10^-4

let x be y and y be the x, so we have




Your answer is 21 for this one.
1) -2/2i
2) you divide the 2's
3) -1/i