The expression -3m[2m+(5-m)]+7

−3m2−15m+7

Step-by-step explanation:

Factor (−3m)(2m+5−m)+7

=−3m2−15m+7

Doesn't factor

the first dot plot best represents the data

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< 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

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