Arithmetic or Geometric?
-4, 2, -1, 1/2
What is Geometric?
Common ratio: -1/2
The Common Difference of -20, -23, -26, -29...
What is -3?
Write the explicit rule for the geometric sequence.
3, 15, 75, 375, 1875, ...
an = 3(5)n-1
Write the explicit rule for arithmetic sequence.
1, 4, 7, 10, 13, ...
an = 1 + 3(n-1)
2 1/2 , 3, 3 1/2, 4, 4 1/2...
What is Arithmetic?
The Common Difference of -1.7, -2.0, -2.3, -2.6...
What is -0.3 ?
Write the explicit rule for the geometric sequence.
324, 108, 36, 12, 4, ...
an = 324(1/3)n-1
Write the explicit rule for the arithmetic sequence.
3, 8, 13, 18, 23, ...
an = 3 + 5(n-1)
2, 4, 6, 8...
What is Arithmetic?
The Common Difference of 18, 22, 26, 30...
What is 4?
The Common Ratio of the Sequence 3, 9, 27, 81...
What is 3?
Write the explicit rule for the geometric sequence.
1, -2, 4, -8, 16, ....
an = 1(-2)n-1
Write the explicit rule for the arithmetic sequence.
-8, -2, 4, 10, 16, ...
an = -8 + 6(n-1)
The Common Difference of 100, 131, 162, 193...
What is 31?
The Common Ratio of the Sequence -3, -1, -1/3...
What is 1/3?
Write the explicit rule for the geometric sequence. Then find a8
3, 6, 12, 24, ...
a8 = 3(2)8-1
a8 = 3(2)
a8 = 3(128)
a8 = 384
Write the explicit rule for the arithmetic sequence. Then find a7.
-6, 1, 8, 15, 22, ...
a7 = -6 + 7(7 - 1)
a7 = -6 + 7(6)
a7 = -6 + 42
a7 = 36
-5, -10, -15, -20
What is what is arithmetic?
The Common Difference of 2.53, 2.56, 2.59, 2.62...
What is 0.03?
The Common Ratio of the Sequence -1000, 200, -40, 8...
What is - 1/5 ?
Write the explicit rule for the geometric sequence. Then find a10
128, 64, 32, 16, 8, ...
a = 128(1/2)10-1
a = 128(1/2)9
a = 128(1/512)
a = 128/512 or 0.25
Write the explicit rule for the arithmetic sequence. Find a10.
11, 4, -3, -10, -17, -24, ...
a10 = 11 + -7(10-1)
a10 = 11 + -7(9)
a10 = 11 - 63
a10 = -52