Which three-dimensional shapes do not have identical cross sections when cut by planes that are parallel to the base?
cone
rectangular pyramid
cylinder
triangular prism

Rectangular pyramid

Step-by-step explanation:

The three dimensional shapes can be cut through planes perpendicular or parallel to the base.

Here, the shapes are being cut parallel to the base.

Since, cone cylinder and triangular prism are identical when cut by planes that are parallel to the base.

Rectangular pyramid do not have identical cross sections.  

Option (b) is correct.

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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