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?

The battery was 19 percent when the charging began.

It took 32.4 minutes for the battery to be fully charged.

Step-by-step explanation:

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.

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