After 5 seconds the height of the balloon is 20 feet. The balloon continues to rise at the same rate

the balloon rises 4ft per second

Step-by-step explanation:

take the 5 and the 2p

divide the 20 by 5

and come out with the end product which is 4ft

< 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⭐