4 years ago

Graph 5x+y=2 and 5x-y=4

Mathematics

1 answer:

Andru [333]4 years ago

7 0

Answer:

What do you mean

Step-by-step explanation:

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If nine times a certain number is subtracted from 7 the result is 52. Find the number.

mezya [45]

Answer:

Let the number to find be x

7 - 9x = 52

-9x = 52-7

- 9x = -45

Divide by - 9

x = 5

The number is 5

Hope this helps.

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OleMash [197]

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Step-by-step explanation:

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Given that k is a positive integer. Find, in terms of k, an expression for Sn, which is the sum of the integers from 2k to 4k in

Elden [556K]

Answer:

$S_n=3k\cdot (2k+1)=6k^2 +3k$

Step-by-step explanation:

k is a positive integer.

Consider an arithmetic sequence:

$a_1=2k\\ \\a_n=4k\\ \\d=1$

First, find n:

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Now, find the sum of these 2k+1 terms:

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