All cds in the store were marked either $12 or $10. the counter at the exit of the store says that 500 people left with cds during the sale, and the cash register contains $5750 from the days sales. maria wrote a system of equations for the number of $10 cds and the number of $12 cds

< 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⭐

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x

d. 145*2 is 290 than the total angle is 360 then minus 290 then divide by two