Help me please Its my last question I need the top part that says "The system of equations is _ and _ .

if you use photomath right away it will give you the answer not like this app that you have to wait for people.

< 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⭐

-2

7 - 9 = -2

reversed:

-2 + 9 = 7

what is the model?

step-by-step explanation: