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Mark charged a battery. Each minute, the percentage of the battery's capacity that was charged increased by 2.5 percent. After 17 minutes of charging, the battery was 61.5 percent full.

How full was the battery when the charging began?

How long from the time that Mark started charging did it take the battery to be fully charged?

Respuesta :

Answer:

69

Step-by-step explanation:

It’s the best number

Answer:

original charge=21/5%

time to full charge=32.4 min

Step-by-step explanation:

an=a+(n-1)d

61.5=a+(17-1)(2.5)

61.5=a+40

a=61.5-40=21.5

original charge=21.5 %

100=21.5+(n-1)(2.5)

100-21.5=(n-1)(2.5)

78.5=(n-1)(2.5)

n-1=(78.5)/2.5=15.7/0.5=31.4

n=31.4+1=32.4

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