Question

3. Given the tenth term of 3.25 and twelfth term of 4.25 find the value of the first term?

Answer 1

Explanation:

You did not state if it is a GEOMETRIC or ARITHMETIC sequence.

GEOMETRIC:

3.25 * r* r = 4.25 shows r = 1.1435

a1 * r^9 = 3.25 a1 = .972

ARITHMETIC:

3.25 + 2d = 4.25 shows d = .5

a1 + 9d = 3.25 shows a1 = -1.25