Question

Find a8 in the arithmetic sequence with a1 = -7 and d= 0.5

Answer 1

For this case we have:

The arithmetic sequence formula is given by:

$a_n = a_1 + (n-1) * d$

Where:

a_n: It's the last term

a_1: It's the first term

n: Position of the term

d: Common difference

We want to find $a_8$:

$a_8 = a_1 + (8-1) * d$

Substituting the values of a_1 and d

$a_8 = -7 + (7) (0.5)$

$a_8 = -7 + 3.5a_8 = -3.5$

Answer:

$a_8 = -3.5$