Question
1.What is the 10th term of 1/2, 1, 3/2, 5/2
2. What is the 15th term of 0.3, 0.9, 0.15
3. What is the 80th term of 8, 13, 21, 29
2. What is the 15th term of 0.3, 0.9, 0.15
3. What is the 80th term of 8, 13, 21, 29
Answers
Reiny
you must know that
term(n) = a + (n-1)d, where n is the term number, a is the first term and d is the common difference
so, for the first one:
n = 10, a = 1/2, d = 1/2
term(1) = 1/2 + 9(1/2) = 5
follow the same method for #2
#3 appears to have a typo, it is neither an arithmetic, nor a geometric sequence.
Did you mean: 5, 13, 21, 29 ??
then a = 5, d = 8
term(n) = a + (n-1)d, where n is the term number, a is the first term and d is the common difference
so, for the first one:
n = 10, a = 1/2, d = 1/2
term(1) = 1/2 + 9(1/2) = 5
follow the same method for #2
#3 appears to have a typo, it is neither an arithmetic, nor a geometric sequence.
Did you mean: 5, 13, 21, 29 ??
then a = 5, d = 8