What is the answer to this mathproblem

The diagram shows a cuboid abcdefgh abcd is a square with area 25cm². find the volume of the cuboid.

Sections of prefabricated woods are each 5 1/3 feet long, how long are 7 1/2 sections placed end to end?

The three sides of a triangle have lengths of 4x+3, 2x+8, and 3x-10. what is the length of the shortest side if the perimeter of the triangle is 136cm?