Please help I need help with this math problem if you help I'll give a total of 40 points make sure make sure to explain with process ​

In what part do you need help with?

Step-by-step explanation:

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Step-by-step explanation:

First problem:

D = 10 inches

f/number = 9

F = ?

if f=F÷D, F=f×D

so F=9×10=90

Second problem:

300 = C+273

-C= -300+273

C= 27

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step-by-step explanation:

< 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⭐