Question

1. Write the nth term of the following sequence in terms of the first term of the sequence.
10, 20, 40, . . .
2.Write the nth term of the following sequence in terms of the first term of the sequence.
2, -4, 8, -16, . . .
3. Write the nth term of the following sequence in terms of the first term of the sequence.
a, a + 4, a + 8, . . .

Answer 1

1. t(n) = 10(2)^(n-1)

Answer 2

2 is :
\[2(-2)^{n-1}\]

Answer 3

3 is :
\[a+4(n-1)\]