Alexandra read a total of 22 books from the public library this summer. she read three books each week, and at the end of the summer, she read three books each week, and at the end of the summer, there were 4 books she hadn't read. create an equation that would you determine the number of weeks alexandria read for this summer and solve.

Equation is 3x + 4 = 22

x = 6

Number of weeks she read is 6.

Step-by-step explanation:

Let x be the number of weeks she read.

Total number of books = 22

Each week she reads 3 books.

After x weeks the number of books left unread = 4

Number of books read in x weeks = 3x

Total number of books = number of books read in x weeks + number of books left unread after x weeks.

22 = 3x + 4

3x = 18

x = 6

Hence number of weeks she read is 6.

< 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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