9*1/2+(2*7+1) hi tjjtbfnjdjrjbdvdhddb

answer:

19.5

step-by-step explanation:

9*1/2+(2*7+1)

= 9*1/2+(14+1)

= 9*1/2+(15)

= 9*1/2+15

= 9/2+15

= 4.5+15

= 19.5

< 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⭐

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.