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iogann1982 [59]

2 years ago

11

PLEEEASEE HELP <8888

1 answer:

4vir4ik [10]2 years ago

4 0

Answer:

D. 56

Step-by-step explanation:

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How much smaller is the sum of the first 1000 natural numbers than the sum of the first 1001 natural numbers?

aleksandr82 [10.1K]

ANSWER

1001

EXPLANATION

The sum of the first n - natural numbers is

$S_n= \frac{n}{2} (2a + d(n - 1))$

The sum of the first 1000 terms is

$S_{1000}= \frac{1000}{2} (2(1) + 1(1000 - 1))$

$S_{1000}=500 (1001)$

$S_{1000}=500500$

The sum of the first 1001 terms is

$S_{1001}= \frac{1001}{2} (2(1) + 1(1001 - 1))$

$S_{1001}= 1001 \times (501)$

$= 501501$

The difference is

$501501 - 500500= 1001$

5 0

2 years ago

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Count by fives from 135 to 175 write these numbers and describe the pattern

Maru [420]

135 140 140 150 155 160 165 170 175
in this pattern you are adding 5 multiple times

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3 years ago

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-5+5=<br> 2-86=<br> simple math

uranmaximum [27]

Answer:

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-84

Step-by-step explanation:

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3 years ago

Plssss quickk!!!! thx guys!!

CaHeK987 [17]

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2 years ago

2x + 9 = -7<br><br> What does x equal to ?

muminat

Answer:

-8

Step-by-step explanation:

2x + 9 = -7

Subtract 9 from both sides

2x = -16

Divide both sides by 2

x = -8

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2 years ago