The answer is \frac{2}{3} = x and \frac{2}{3} =x
B because it’s the only one with a negative and normal number
By definition the perimeter of an ellipse is given by:

Where,
a: semimajor axis of the ellipse
b: minor semiaxis of the ellipse
Substituting values we have:

When doing the corresponding calculations, we have that the perimeter is given by:

Round to the nearest tenth:
Answer:
the estimated perimeter of the ellipse is:
D'(p) = -8p + 160
<span>-8p + 160 = 0 </span>
<span>-8p = -160 </span>
<span>p = 20 </span>
<span>~~~ </span>
<span>B) Number of drills sold when p = 20 is </span>
<span>D(20) = [ -4(20)^2 + 160(20) - 270 ] = 1,130 drills </span>
I think this is right, i tried.
Answer: 25
Step-by-step explanation: