this question has to do with arithmetic sequences

A certain species of tree grows an average of 0.5 cm per week. Write an equation for the sequence that represents the weekly height of this tree in centimeters if the measurements begin when the tree is 800 centimeters tall.

Question

this question has to do with arithmetic sequences

A certain species of tree grows an average of 0.5 cm per week. Write an equation for the sequence that represents the weekly height of this tree in centimeters if the measurements begin when the tree is 800 centimeters tall.

xapproachesinfinity · Answer

Well you have the first as 800 
And the common difference is 0.5
Yiu are given everything