Answer:
13.3 * 10^26
Step-by-step explanation:
(1.898 * 10^27) - (5.68 * 10^26)
1.898 * 10^27 - 5.68 * 10^26
(1.898 * 10 - 5.68) * 10^26
(18.98 - 5.68) * 10^26