For a box shown in the images, to see the more cost-effective option, one has to simply compare which of the two boxes has the large volume. This can be done by multiplying the length, width, and the height to find the volume. This is shown below:
Box A:
Volume = 2 * 3 * 4 = 24 ft^3
Box B:
Volume = 2 * 5 * 2.5 = 25 ft^3
Therefore, the second box is the more cost-effective of the two.
A = pi(r) ^2
A = 3.14(5) ^2
A = 15.7 ^2
A = 246.49
Hope this helps.
This falls under geometry. The two labeled angles are congruent, which means the line segment between them (AD in the image) is a bisector of the angle at vertex A. Use the angle bisector theorem, which says that




The correct answer to that would be b