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3 years ago

PLEASE HELP ME!!!!!!! I HAVE EITHER 1 OR 2 ATTEMPTS TO GET IT RIGHT!!

Mathematics

1 answer:

Zinaida [17]3 years ago

7 0

You just have to make equal fractions, so if c = 4 that means $\frac{a}{5}$ = $\frac{4}{7}$ so cross multiply to get 7a = 20; divide both sides by 7 to get a = 2.86 and do the same with the other ones

If c = 11 then $\frac{a}{5}$ = $\frac{11}{7}$ cross multiply to get 7a = 55; divide both sides by 7 to get a = 7.86 and so on

The answer is true to the other question

Hope this helps :)

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3 years ago

In a recent year, the top-selling cookie in America was Nabiscos Chips Ahoy, with sales of $294.6

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4 years ago

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$lets \: assume \: the \: water \: gallon \: has \: 1000litres \\$

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3 years ago

Use the following diagrams for questions 3 and 4 questions in picture please help

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Find the sum of 14 + 8 + 2+ ... + ( 274) + (-280).

Musya8 [376]

The sum of the given sequence is -6384.

Step-by-step explanation:

The given Arithmetic sequence is 14 + 8 + 2+ ... + ( 274) + (-280).

The first term of the sequence = 14
The last term of the sequence = -280
The common difference ⇒ 14 - 8 = 6

To find the number of terms in the sequence :

The formula used is $n = (\frac{a_{n}-a_{1}} {d})+1$

where,

n is the number of terms.
$a_{n}$ is the late term which is -280.
$a_{1}$ is the first term which is 14.
d is the common difference which is 6.

Therefore, $n =(\frac{-280-14}{6}) +1$

⇒ $n =( \frac{-294}{6}) + 1$

⇒ $n = -49 + 1$

⇒ $n = -48$

⇒ n = 48, since n cannot be negative.

∴ The number of terms, n = 48.

To find the sum of the arithmetic progression :

The formula used is $S = \frac{n}{2}(a_{1} + a_{n} )$

where,

S is the sum of the sequence.
$a_{1}$ is the first term which is 14.
$a_{n}$ is the late term which is -280.

Therefore, $S = \frac{48}{2}(14+ (-280))$

⇒ $S = \frac{48}{2}(-266)$

⇒ $S = 48 \times -133$

⇒ $S = -6384$

∴ The sum of the given sequence is -6384.

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3 years ago