Answer:
24x^2 - 360x + 1200
Step-by-step explanation:
Quite tricky but my answer would be D
Answer:
diameter
circumference

diameter
Step-by-step explanation:
First, find the length of the diameter (d) and the length of the circumference of the circle (c).
Next, divide the length of the circumference c by the length of the diameter d and set up an equation

where the ratio equals to
(the definition of
)
Then, solve the equation for the circumference c:

Finally, substitute 2 times the radius for the diameter

The first one, the fourth one, and the fifth one.