Answer:
[tex]7560[/tex] seconds
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Step-by-step explanation:
Each minute has [tex]60[/tex] seconds. So, [tex]3[/tex] minutes has [tex]3 * 60 = 180[/tex] seconds.
Since each second the airplane rises by [tex]42[/tex] meters, [tex]180 * 42 = 7560[/tex] meters high after [tex]3[/tex] seconds.
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