Which two activities are examples of data collecting? A. Graphing the lengths of fish in a pond
B. Weighing dogs
C. Using the results of a race to predict who will win future races
D. Asking people what their favorite show is

I think a and d

Step-by-step explanation: hope that helps

< 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⭐

47 - 90 = 43

43 - 180 = x

x = 137