A battery is charged. The percentage of the battery's capacity that is charged as a function of time (in minutes) is graphed.
1007
90-
80+
70+
60+
50+
Capacity (% charged)
40
30
20-
10+
5
10
15
20
25
30
Time (minutes)
What was the battery's charging level when the charging began?

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐

the answer is a.

step-by-step explanation:

in three games of golf, alex shot two under par four times.