Differentiate between rational numbers and irrational numbers

Ablock of wood is a cube whose side is x in. long. you cut off a 1-inch thick piece from the entire right side. then you cut off a 3-inch thick piece from the entire top of the remaining shape. the volume of the remaining block is 2,002 in3. what are the dimensions of the original block of wood?

Josephine has a great garden with and area of 2x2 + x - 6 square feet

Which value is not a solution of 8x^3 – 1 = 0