A blackboard with mathematical equations written in chalk, including variables like Q and P, and calculations involving these variables. An eraser and pieces of chalk are on the chalkboard's tray.
A hand holding a solved Rubik's Cube with red, blue, and yellow faces visible. The background shows a modern interior with colorful chairs and a wooden decorative piece on the wall.
A Rubik's Cube with white, green, and red faces is placed on an orange surface. The cube appears solved from the visible sides, and the background is uniformly textured.
A person stands in front of a whiteboard writing mathematical equations. The silhouette is visible against the softly illuminated board filled with handwritten mathematical expressions.
A Rubik's Cube with visible sides showing yellow, green, and red squares on a white background. The cube is rotated, displaying three sides, and appears to be in a solved state.