Answer:
8 centimeters.
Step-by-step explanation:

Divide 3 both sides:

Multiply 4 on both sides:

8cm on the map represents 20km.
The answer should be 2.12
For a variable to vary directly to another is telling you to set up a proportion
v/g = v/g
36/4 = v/11
4v = 396
v = 99
t=100
p=3000
t 1/2 = 20
Try inserting the numbers in the half-life formula.
D.
it is a linear function as each time x increases by 1, y increases by 18