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Any number that you choose can be the 15th number. It is easy to find a rule based on a polynomial of order 4 such that the first four numbers are as listed in the question followed by the chosen number as the 15th term. There are also non-polynomial solutions. Short of reading the mind of the person who posed the question, there is no way of determining which of the infinitely many solutions is the "correct" one.
One possible solution is to use the following polynomial of order 3 for the first 4 numbers:
U(n) = (-32*n^3 + 228*n^2 - 478*n + 291)/3 for n = 1, 2, 3, ...
so that U(15) = -21193
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What is the value of the seventh term in the sequence 1 -3 -7 -11 -15?
every next term is 4 smaller than previous so 7th term = -23
What is the nth term of this sequence 15 9 3 -3 -9?
after -9 it is -15 then -21, -27 and the ninth is -36
What is the nth term for this sequence 3 7 11 15 19?
Double it minus the previous number.
What is the r value of the following sequence 6 -18 54 -162?
To find the common ration in a geometric sequence, divide one term by its preceding term: r = -18 ÷ 6 = -3 r = 54 ÷ -18 = -3 r = -162 ÷ 54 = -3
What is the closed form of a geometric sequence with ratio between consecutive terms 3 and inital term 15?
It is U(n) = 15*3^(n-1) = 5*3^n for n = 1, 2, 3, ...
What is the value of the seventh term in the sequence 1 -3 -7 -11 -15?
every next term is 4 smaller than previous so 7th term = -23
What is the position to term rule in this sequence 7 11 15?
To find the equation of a sequence, you first have to look at the differences between the numbers. In this case the differences are 4, and 4. Thus the equation begins 4n. The sequence minus 4n is: 3, 3, 3 Thus the equation in its entirety is that the value of the term in position n is 4n+3
What is the nth term for 7 11 15 19?
The nth term in this sequence is 4n + 3.
What is the value of the 11th term in the sequence 3 6 12 24?
It is: -3072
What is the value of the 11th term in the sequence -3 -6 -12 -24 ...?
It is: -3072
What is the nth term of this sequence 15 9 3 -3 -9?
after -9 it is -15 then -21, -27 and the ninth is -36
What is the next term in the following sequence of numbers 2 6 3 9 6 18 and why?
15 since you multiply by 3 then subtract 3 in sequence
What is the nth term in the sequence 3 7 11 15?
The nth term is 4n-1 and so the next term will be 19
What Is the nth term of the number sequence 15 12 9 6?
According to Wittgenstein's Finite Rule Paradox every finite sequence of numbers can be a described in infinitely many ways and so can be continued any of these ways - some simple, some complicated but all equally valid. Conversely, it is possible to find a rule such that any number of your choice can be the next one.The simplest rule is un = 18 - 3n
What is the nth term for the sequence -1 5 15 29 47 69?
is 219 in the sequence of 4n-3
What is the nth term for this sequence 3 7 11 15 19?
Double it minus the previous number.
What is the value of the 7 term of the Fibonacci sequence?
0, 1, 1, 2, 3, 5, 8 so the 7th term is 8
