Pls help really fast I don't know this

(3, 1 )

Step-by-step explanation:

The centre of the circle is at the midpoint of the diameter.

Given endpoint (x₁, y₁ ) and (x₂, y₂ ) then the midpoint is

( , )

Here (x₁, y₁ ) = (9, 7) and (x₂, y₂ ) = (- 3, - 5 ) , then

midpoint = ( , ) = ( , ) = (3, 1 )

Thus centre of circle = (3, 1 )

5   1/4   miles per hour

step-by-step explanation:

15   3/4 / 3 = 5   1/4