Answer:
3
Step-by-step explanation:

a = 3 & b =4
For this case we have that the inverse variation is defined as:

Where:
k: It is the constant of proportionality
According to the statement we have:

We find the constant of proportionality:

Then we find the value of x when
:

Answer:

David will finish first, because if you divide Brad's miles by 2 to his miles in a 1/4 of an hour are 5.95 miles. This means David went 6.2 miles in the same time that Brad went 5.95. Therefore, David will finish first.
Answer:
78.5
Step-by-step explanation:
area of a circle is 
3.14(
)=78.5