6.241 × 1018 written in regular notation is 6,241,000,000,000,000,000
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18! This is the simplest of arithmetic!
8.9 x 10^18 x 78 = 694.2 x 10^18 = 694200000000000000000
-10
10% off $18 = $18 - ( 0.1 x $18) = $16.2
28-18=10 or 18-28= -10