Question

PLEASE HELP?!?!?!?!
The number of trees in a forest is 80 million in 1997 and increasing at a rate of 0.1 million trees per year. The total mass of wood in the entire forest at the start of 1997 is 3*10^10 kilograms In 1997 the total mass was increasing at a rate of 3% per year.
a)What is the avg mass per year?
b) Is this avg increasing or decreasing?
c) How quickly?

Answer 1

a)What is the avg mass per year?

I think they are asking what is the average mass of a tree in 1997.

To find it, take the mass of all the trees and divide by the number of trees.
This is an exercise in using scientific notation.
can you do that?

Answer 2

let me try

Answer 3

the answer i got was 7,381,125 it wasn't correct

Answer 4

re-reading it, they want the average mass per year, which suggests it is a function of time.
i.e. not a single number. all I can think of is an expression like
\[ \frac{8e7 + 1e5 t}{3e10\cdot(1.03)^t} \]
which looks complicated...
I have not seen this type of problem before, so I could be way off base on it.