Explain the difference between

(3z)^3 and 3z^3

Step-by-step explanation:

Brackets in mathematics are a little like periods in grammar.

They tell you exactly what you need to do.

In the question you have listed

3z^3 means that only the z is raised to the third power.

(3z)^3 means both the 3 and the z are raised to the third power. 3^3 * z^3 =

27 z^3     This is a valuable question to know the answer to.

< 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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step-by-step explanation:

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