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katen-ka-za [31]

2 years ago

11

The one is for my younger sis Lindsay has to read a 72-page book in 6 days. If she reads an equal number of pages each day, how

many pages will Lindsay need to read each day to complete the book?
A. 9
B. 10
C. 11
D. 12

2 answers:

velikii [3]2 years ago

8 0

Answer:

The answer is D. She will need to read 12 pages every day.

Step-by-step explanation:

Just divide 72 by 6. Which equals 12.

I hope this helps :)

lianna [129]2 years ago

5 0

Answer:

D. she will need to read 12 pages a day

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$\displaystyle \sum_{k=1}^n k = 1 + 2 + 3 + \cdots + n = \frac{n(n+1)}2$

It follows that

$a_1 + a_2 + \cdots + a_n = \displaystyle \sum_{k=1}^n (a_1 + 2(k-1)) \\\\ ~~~~~~~~ = a_1 \sum_{k=1}^n 1 + 2 \sum_{k=1}^n (k-1) \\\\ ~~~~~~~~ = a_1 n + n(n-1)$

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$\displaystyle \sum_{k=1}^n ar^{k-1} = \frac{a(1-r^n)}{1-r}$

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