Q: What number is next 298 209 129 58 -4?

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298 209 129 58 -4

298 209 129 58 -4

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 next number is -57

-57

-57

-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

-55

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.

negative fifty seven

-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

-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.

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

The answer that follows is -57 Logic is explained in the related link to another wiki question.

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

-57 (each number that is subtracted from the first is 9 different from the previous (i.e. 298-89=209-80=129-71=58-62=-4-53=-57). As you can see, the amounts that are substracted are 89, 80, 71, 62, 53 (all 9 different from the one before it.)

-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).

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

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

-57. You are taking away 9 less each time.

-57. Fit the polynomial t(n) = (9n2 - 205n + 792)/2 for n = 1, 2, 3, ...

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.

It is a quadratic sequence (order 2) t(n) = (9n2 - 205n + 792)/2 for n = 1, 2, 3, ... and the next number is -57

-57explained in http://wiki.answers.com/Q/Next_number_in_series_298_209_129_58_-4-KS