3 years ago

Five books cost¢21. what is the price cost of seven similar books

Mathematics

1 answer:

Liono4ka [1.6K]3 years ago

5 0

Answer:

Your answer should be $29.40

Step-by-step explanation:

If you divide 21 by 5 you get 4.2, so each book costs $4.20.

4.2 x 7 = 29.4

Therefore, your total cost for 7 books will be $29.40

I hope this helps!

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Write the sum using summation notation, assuming the suggested pattern continues.

Lina20 [59]

<u>ANSWER</u>

$\sum _{n = 1} ^{18} (6n - 15)$

<u>EXPLANATION</u>

The given series

$- 9 - 3 + 3 + 9 + ... + 81$

This is an arithmetic series with a common difference of

$d = - 3 - - 9 = 6$

The first term of the series is:

$a_1 = - 9$

The general term is given by:

$a_n =a_1 + d(n - 1)$

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$\sum _{n = 1} ^{18} (6n - 15)$

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3 years ago

Five books cost¢21. what is the price cost of seven similar books​

Five books cost¢21. what is the price cost of seven similar books