Question

Which recursive formula correctly models the values shown in the table?

n 1 2 3 4 5
an 5 15 45 135 405

a. an+1=an+10, a1=5

b. an+1=an+5, a1=10

c. an+1=an⋅3, a1=5

d. an+1=an⋅5, a1=3

Answer 1

The right answers are

1. C, 1

2. B, an+1 = an x 3, a1 =5

3. C, an = -6 x 0.5^n-1

4. D, an + 2/3 x (1/2)^n-1

5. D, an+1 = an x (-2), a1 = 5

I just took the test and got 100% so these should be correct