Your answer is one cause 1x2 =2 and then you do the opposite

One way to do this problem is to determine the common difference. If the 5th and 8th terms are -9 and -21, we can do this by subtracting -9 from -21:

-21-(-9) = -12. The 5th and 8th terms are not consecutive, so we have to think in terms of (8-5), or 3, times the common difference to get from -9 to -21.

Note that -12 divided by 3 is -4. Thus, the common difference is -4.

Check: -9 - 4 = -13; -13 - 4 = -17; -17 - 4 = -21 (which is correct).

We know that the 5th term is -9. To find the 4th term, work backwards: subtract (-4) from -9, which produces -9+4=-5.

The fourth term is -5. Subtracting -4 from this (which is the same as adding 4 to this -5) produces the third term; it is -1. Can you now find the 2nd and 1st terms using the same approach?

<span>Is it 0.262626...?

repeating decimals you have to write at least two of the repeats so it is obvious what is repeating.

1000x = 262.62626...

10x = 2.62626...

1000x - 10x = 260

990x = 260

x = 26/99</span>

P(volleyball and baseball) = 4/200 x 100 = 2%

P(either volleyball or baseball) = P(volleyball ∪ baseball) = P(volleyball) + P(baseball) - P(volleyball and baseball) = 12% + 15% - 2% = 25%.

25% play either volleyball or baseball.