Question

A battery is charged. The percentage of the battery's capacity that is charged as a function of time (in minutes) is graphed 0 IT) HE + What was the battery's charging level when the charging began?

Answer 1

look closely to the graph

when the time (which is on the x-axis) was zero (0),

the capacity of the battery (which is on y-axis) was already at 40% left

Now, the battery's charging level when the charging began was 40%