#### Answer

(a) 0.003221 mm
(b) 894000 m
(c) 0.00000000000135082 $m^3$
(d) 641.00 km

#### Work Step by Step

1. For negative exponents, move the decimal point to the left by the same times as its value indicates:
$Hint$: If the first number is between 1 and 10, you will just add "n" zeros to the left, where "n" is the exponent number. Finally, we put a decimal point between the first and the second zero.
(a) The exponent is "-3", so we move the decimal point by 3 times to the left (You will have to add "zeros" to represent the number):
1 to the left: $0.3221$
2 to the lef: $0.03221$
3 to the left: $0.003221$
(c) The exponent is "-12", so we have to move the decimal point 12 times to the left:
12 to the left $0.00000000000135082$.
2. For positive exponents, the decimal point will be moved to the right:
** Remember to put "zeros" wherever it is necessary.
(b) We will have to move the decimal point by 5 times to the right:
3 to the right: $8940.$
Now, we just have to add 2 more "zeros" (To complete 5):
$894000$
(d) 2 times to the right:
$641.00$