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Svetradugi [14.3K]
2 years ago
10

Add 8x to 2x and then subtract 5 from the sum. If x is a

Mathematics
1 answer:
Anuta_ua [19.1K]2 years ago
7 0

Answer:10

Step-by-step explanation:

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3 years ago
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2 years ago
What is the sum of all positive integers less than 300 which are divisible by 3
drek231 [11]

Answer:

14,850

Step-by-step explanation:

You need the sum of

3 + 6 + 9 + 12 + ... + 294 + 297

Factor out a 3 from the sum

3 + 6 + 9 + 12 + ... + 294 + 297 = 3(1 + 2 + 3 + 4 + ... + 98 + 99)

You need to add all integers from 1 to 99 and multiply by 3.

The sum of all consecutive integers from 1 to n is:

[n(n + 1)]/2

The sum of all consecutive integers from 1 to 99 is

[99(99 + 1)]/2

The sum you need is 3 * [99(99 + 1)]/2

3 + 6 + 9 + 12 + ... + 294 + 297 =

= 3 * [99(99 + 1)]/2

= 3 * [99(100)]/2

= 3 * 9900/2

= 14,850

4 0
2 years ago
Two is subtracted from a number, and then the difference is multiplied by 5. The result is 30
Vanyuwa [196]

Answer:

8

Step-by-step explanation:

8-2=6

6x5=30

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2 years ago
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