For every negative power you divide by 10
<span>It costs 19.48, because $16,421.40 / 843 comes out to 19.479, and 19.479 rounds to 19.48. So the answer is B $19.48</span>
If you plug in the x and y, you get
7(1)(3)
7 x 1 x 3 = 21, so the answer is 21