Question

20 points
What is the explicit formula for this sequence? -5,-3,-1,1,3

Answer 1

B

Explanation:

a1 = -5

a2 = -3

a3 = -1

and so on

So since we start with -5 it will be -5+ something.

each time you add 2, but since the first one doesnt add anything we want n-1 times 2 so that leaves us with -5+(n-1)2

Answer 2

It is B because the formula is 1st term (a) + (n-1) (T2-T1)