Answer:
The answer would be 12
Step-by-step explanation:
because all u have to do is multiply
The independent variable is x
y is dependent on the value of x
Everything about number one is because it's a half of circle so its area = 1/2 ¶r^2 and its perimeter = ¶r

the fractions are set up so that each unit cancels out until its only meters/hour
you can multiply all the numerators together to get 72000 and all the denominators to get 1
72000 meters/1 hour
72000 meters in 1 hour
hope this helped