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Q: What number comes next in this series 298 209 129 58 -4?

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The next number is -57

298 209 129 58 -4

298 209 129 58 -4

-57

-57

-55

negative fifty seven

-57... You're subtracting 9 from the difference each time.

-57The first two numbers in the series has a difference of 89. The next two numbers (209, 129) has a difference of 80. The next two (129,58) has a difference of 71. As you can see the differences change by 9, so the next two numbers in the series (58, -4) has a difference of 62. Following this pattern, the next two numbers in the series will have a difference of 53. So the next number in this series will be (-4-53 = -57).

129+1

It is 129.

The sequence is formed by subtracting 89 at the first step and then reducing this figure by 9 at each successive step. 298 - 89 = 209 209 - 80 = 129 129 - 71 = 58 58 - 62 = -4 -4 - 53 = -57........this is the next number in the series.

The difference between one number and the next in the sequence is decreasing by 9 each time. Therefore, the difference between -4 and the next number will be equal to 62 - 9 = 53. The next number is therefore equal to -4 - 53 = -57.

65 followed by 129

-57

The difference between successive numbers reduces by 9 at each step.298 - 89 = 209209 - 80 = 129129 - 71 = 5858 - 62 = -4-4 - 53 = -57.............which is the required next number

-57

-4 t(n) = (9n2 - 205n + 792)/2 for n = 1, 2, 3, ...

-4 or -17 if you use t(n) = (4n4 - 44n3 + 191n2 - 859n + 2496)/6

129 The numbers are prime (don't consider the prefix 1)

-57 298 - 89 = 209 209 - 80 = 129 129 - 71 = 58 58 - 62 = -4 -4 - 53 = -57 notice every number is subtracted by 9 less than the previous number's subtrator

298 less 209 is 89 209 less 129 is 80 129 less 58 is 71 58 less -4 is 62 The result of each subsequent equation is 9 less than the previous one (89, 80, 71...). The next result is going to be 62-9=53. The first number in each equation above is the same as the second number in the previous equation: 298 less 209 is 89 209 less 129 is 80So, the next equation will be: -4 less X is 53 Therefore, X is the next number in the original sequence, which resolves to: -57

At each step the number being subtracted is reduced by 9 298 - 89 = 209 209 - 80 = 129 129 - 71 = 58 58 - 62 = -4 -4 - 53 = -57..........which is the next number.

The are a number of mathematical operations that gives us the number 129. When you add 100 to 29 you will get 129. Similarly when you subtract 11 from 140, you will get 129.

-57298-209=89; 209-129=80; 129-58= 71; 58-(-4)=58+4=62. The differences go down by nine, so the next difference will be 53.-4-53=-57.