Answer:The line that is congruent to angle 4 is angle 1
hope this helped :)
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Answer:
100000000
Step-by-step explanation:
6 times 10 to the 8th is 600,000,000
5 times 10 to the 7th is 500,000,000
600,000,000-500,000,000=100,000,000
i think you might have to round or something