Answer:
16
Step-by-step explanation:
To solve plugin -3 for n

Then, solve using PEMDAS. First, do exponents

Next, add

So, 16 is the final answer.
1.) 8,281 people/km²
2.)
3.) 1226.88 grams
4.) 999.74 grams
5.) 6
I am not sure about number 2.
4) because 10 x 10 is 100
If you mean lowest terms as in fully simplified, then your fraction "2/11" is already in lowest terms.
Lowest terms mean that your numerator and denominator have no common factors apart from 1.
2 and 11 don't have any common factors, therefore 2/11 is in lowest terms already.
-4 - (-36) = -4 + 36 = 32 units