Recursive formula of 6, 7, 7.5, 7.75

6, 7, 7.5, 7.75

If we look, after the first two number, the next is gotten by adding half of the difference of the two numbers before to the last number.

6, 7

The next is:

7 - 6 = 1, 

1/2 = 0.5

7 + 0.5 = 7.5  So the next is 7.5.

So we have  7 and 7.5

7.5 - 7 = 0.5

0.5/2 = 0.25

7.5 + 0.25 = 7.75

So if we have  Tₓ,  Tₓ₊₁,

So by observation, we can say the recursive formula is:

Tₓ₊₂  =   Tₓ₊₁ + (Tₓ₊₁ - Tₓ)/2

What are the options

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's