5500 trees were planted in a forest on 1" October 2018, Only 5060 of these trees were still alive on 1" October 2019.
It is assumed that the number of trees still alive is given by N = ar'
where N is the number of trees still alive t years after 1" October 2018.
a) Write down the value of a.
b) Work out the value of r.

The answer is why would a teacher ask that

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?

None because i don’t know.