Population of a certain country is decreasing by 0.8% every year. The population in 2015 is 9 million, what will be the population in 2016

is it 16200000

In a small oak tree, the biomass of insects makes up 3000 kilograms. This is 4% of the total

biomass of the tree. What is the total biomass of the tree?

is it 7500

No. Your answer shows a huge increase, not a decrease.

0.992 * 9,000,000 = ?

where did you get 0.992?

1.00 - 0.8 = 0.992

0.04x = 3,000

so for the first question my answer is 892800?

where did you get 1.00?

No. 8.928,000

If you use commas in the appropriate places it's easier to read the numbers.

8,928,000