What is the recursive rule for the sequence? 1.2, 0.4, −0.4, −1.2, −2, …

an=a n−1 + 0.8 , where a1=1.2
an=a n+1 + 0.8 , where ​ a1=1.2
an=a n+1 − 0.8 , where ​ a1=1.2
an=a n−1 − 0.8 , where ​ a1=1.2

I’m stuck on this i don’t understand.

Yoku is putting on sunscreen. he uses 2\text{ ml}2 ml to cover 50\text{ cm}^250 cm 2 of his skin. he wants to know how many milliliters of sunscreen (c)(c) he needs to cover 325\text{ cm}^2325 cm 2 of his skin. how many milliliters of sunscreen does yoku need to cover 325 \text{ cm}^2325 cm 2 of his skin?

Use complete sentences to differentiate between a regular tessellation, and a pure tessellation. be sure to include specific types of polygons in your explanation.