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Happygirl5715
07.07.2019 •
Mathematics
Ruben bought 6 new book which increased his collection by 12%. how many books did he have?
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Ответ:
The initial number of books he had=50
The number of books he has after adding new books=56
Step-by-step explanation:
Step 1: Derive formula for percentage increase
The formula for calculating the percentage increase is;
p={(f-i)/i}×100
where;
p=the percentage increase
f=the final number of books he had
i=the initial number of he had
In our case;
p=12%
(f-i)=defines the increase in the number of books=6
i=unknown
Substitute and solve for i;
12%=6/i
(12/100)=6/i
(12/100)×i=6
i=6×100/12
i=50
The initial number of books he had=50
The number of books he has after adding new books=50+6=56
Ответ:
Preimage = (-19,-14)
Step-by-step explanation:
i think your asking abt the preimage so that would be the answer