Question

for the arthmectic sequence 5, 7, 9, ...... find A find A is it 21 17 19 or 12for the arthmectic sequence 5, 7, 9, ...... find A is it 21 17 19 or 12

Answer 1

The common difference in the arithmetic sequence is 2, so to find the value of A, we need to determine the position of the number in the sequence.

Since the first number is 5, the position of A is the 9th number in the sequence. To find the value of A, we can use the formula:

A = First number + (n-1) * common difference

A = 5 + (9-1) * 2 = 5 + 8 * 2 = 5 + 16 = 21

Therefore, A is 21.