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scoundrel [369]

3 years ago

12

One number is 9 times a first number. a third number is 100 more than the first number. if the sum of the three numbers is 727,

find the numbers.

1 answer:

Zielflug [23.3K]3 years ago

8 0

First number: 57
Second number: 513
Third number: 157

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Which of the following is an irrational number?

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A. 1.9 is an irrational number

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What is the term of a 7-term geometric series if the first term is -11 the last term is -45,056 and the common ratio is -4

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I assume you mean to ask how to find the sum of the seven terms?

You have

$a_2=ra_1$
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$a_4=ra_3=r^3a_1$
...
$a_7=ra_6=r^6a_1$

So the sum is

$a_1+ra_1+r^2a_1+\cdots+r^6a_1=a_1(1+r+r^2+\cdots+r^6)=a_1\times\dfrac{1-r^7}{1-r}$

You know that $a_1=-11$ and $r=-4$ , so the sum is equal to

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3 years ago

4(x)+2 Is -18 what is x

Harrizon [31]

Answer:

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Step-by-step explanation:

$4x = - 18 - 2 \\ x = \frac{ - 20}{4} \\ = - 5$

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