Ask a New Question

In a certain arithmetic sequence, t6 + t15 = –141 and the common difference is –7.

What is the first term of the sequence?

explain how to do this please

1 answer

you know t6 = a+5d
you know t15 = a+14d

so a+5d + a+14d = -141

don't you know d= -7 ???

take over ....

Ask a New Question or answer this question.

Similar Questions

Tell whether the sequence is arithmetic. If it is, identify the common difference.one-half, one-third, one-fourth, ellipsis (1
1. 1 answer
Tell whether the sequence is arithmetic. If it is, identify the common difference.one-half, one-third, one-fourth, ellipsis (1
1. 1 answer
Tell whether the sequence is arithmetic. If it is, identify the common difference.one-half, one-third, one-fourth, ellipsis (1
1. 1 answer
Determine whether sequence appears to be an arithmetic sequence. If so, find the common difference and the next three terms in
1. 1 answer

more similar questions